diff --git a/.github/workflows/test_pip.yml b/.github/workflows/test_pip.yml new file mode 100644 index 0000000..721df6a --- /dev/null +++ b/.github/workflows/test_pip.yml @@ -0,0 +1,43 @@ +# This workflow will install Python dependencies, run tests and lint with a variety of Python versions +# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions + +name: build + +on: + push: + branches: [ master ] + pull_request: + branches: [ master ] + +jobs: + build: + + runs-on: ubuntu-latest + strategy: + fail-fast: false + matrix: + python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"] + + steps: + - uses: actions/checkout@v2 + - name: Set up Python ${{ matrix.python-version }} + uses: actions/setup-python@v2 + with: + python-version: ${{ matrix.python-version }} + - name: Install dependencies + run: | + curl -sSL https://install.python-poetry.org | python3 - + poetry install --all-extras + poetry --version + poetry show + python --version + pip --version + - name: Lint with flake8 + run: | + # stop the build if there are Python syntax errors or undefined names + poetry run flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics + # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide + poetry run flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics + - name: Test with pytest + run: | + poetry run python -m pytest --skip-numerical diff --git a/README.md b/README.md index 7d098a9..8f87166 100644 --- a/README.md +++ b/README.md @@ -1,3 +1,5 @@ +[![Python package](https://github.com/groupmm/libtsm/actions/workflows/test_pip.yml/badge.svg)](https://github.com/groupmm/libtsm/actions/workflows/test_pip.yml) + # libtsm A Python toolbox for Time-Scale Modification (TSM) and Pitch-Shifting. @@ -32,7 +34,7 @@ IEEE Signal Processing Letters, 21(1): 105–109, 2014. ## Installation -With Python >= 3.6, you can install libtsm using the Python package manager pip: +You can install libtsm using the Python package manager pip: ``` pip install libtsm diff --git a/docs/Makefile b/docs/Makefile index d0c3cbf..59f4366 100644 --- a/docs/Makefile +++ b/docs/Makefile @@ -4,7 +4,7 @@ # You can set these variables from the command line, and also # from the environment for the first two. SPHINXOPTS ?= -SPHINXBUILD ?= sphinx-build +SPHINXBUILD ?= poetry run sphinx-build SOURCEDIR = source BUILDDIR = build diff --git a/docs/build/doctrees/environment.pickle b/docs/build/doctrees/environment.pickle index ba906a6..3d993e3 100644 Binary files a/docs/build/doctrees/environment.pickle and b/docs/build/doctrees/environment.pickle differ diff --git a/docs/build/doctrees/getting_started.doctree b/docs/build/doctrees/getting_started.doctree index 3b7d832..0fcd8bd 100644 Binary files a/docs/build/doctrees/getting_started.doctree and b/docs/build/doctrees/getting_started.doctree differ diff --git a/docs/build/doctrees/index.doctree b/docs/build/doctrees/index.doctree index 27da12e..a9ed646 100644 Binary files a/docs/build/doctrees/index.doctree and b/docs/build/doctrees/index.doctree differ diff --git a/docs/build/doctrees/index_pitchshift.doctree b/docs/build/doctrees/index_pitchshift.doctree index dc175ef..2f65561 100644 Binary files a/docs/build/doctrees/index_pitchshift.doctree and b/docs/build/doctrees/index_pitchshift.doctree differ diff --git a/docs/build/doctrees/index_tsm.doctree b/docs/build/doctrees/index_tsm.doctree index c2a3d7a..d721b2e 100644 Binary files a/docs/build/doctrees/index_tsm.doctree and b/docs/build/doctrees/index_tsm.doctree differ diff --git a/docs/build/doctrees/index_utils.doctree b/docs/build/doctrees/index_utils.doctree index ee117f9..4027512 100644 Binary files a/docs/build/doctrees/index_utils.doctree and b/docs/build/doctrees/index_utils.doctree differ diff --git a/docs/build/html/.buildinfo b/docs/build/html/.buildinfo index d984524..c40089f 100644 --- a/docs/build/html/.buildinfo +++ b/docs/build/html/.buildinfo @@ -1,4 +1,4 @@ # Sphinx build info version 1 -# This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done. -config: 0250076a94f1b39aaff4df54a8bcd128 +# This file records the configuration used when building these files. When it is not found, a full rebuild will be done. +config: a375c7d903652087cc09c5217861df63 tags: 645f666f9bcd5a90fca523b33c5a78b7 diff --git a/docs/build/html/.buildinfo.bak b/docs/build/html/.buildinfo.bak new file mode 100644 index 0000000..d984524 --- /dev/null +++ b/docs/build/html/.buildinfo.bak @@ -0,0 +1,4 @@ +# Sphinx build info version 1 +# This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done. +config: 0250076a94f1b39aaff4df54a8bcd128 +tags: 645f666f9bcd5a90fca523b33c5a78b7 diff --git a/docs/build/html/_modules/index.html b/docs/build/html/_modules/index.html index b91358d..ae485b1 100644 --- a/docs/build/html/_modules/index.html +++ b/docs/build/html/_modules/index.html @@ -1,168 +1,78 @@ - + - - - Overview: module code — libtsm 1.1.1 documentation - - - - - - - + Overview: module code — libtsm 1.2.0 documentation + + - - - - - - - - - - - - - - - - - - - - + + + + + + - - - +
- -
- - -
- - - - - - - - + \ No newline at end of file diff --git a/docs/build/html/_modules/libtsm/pitchshift.html b/docs/build/html/_modules/libtsm/pitchshift.html index 4197da0..b746a75 100644 --- a/docs/build/html/_modules/libtsm/pitchshift.html +++ b/docs/build/html/_modules/libtsm/pitchshift.html @@ -1,20 +1,20 @@ + + - + - libtsm.pitchshift — libtsm 1.1.1 documentation - - + libtsm.pitchshift — libtsm 1.2.0 documentation + + - - - - - + + + + + @@ -32,9 +32,6 @@ -
- 1.1.1 -
@@ -85,16 +82,18 @@

Source code for libtsm.pitchshift

 This file is part of libtsm (https://www.audiolabs-erlangen.de/resources/MIR/2021-DAFX-AdaptivePitchShifting)
 """
 
-import numpy as np
-import scipy as sc
-import scipy.signal
-import scipy.interpolate
-from fractions import Fraction as frac
-from .tsm import hps_tsm
-from .utils import normalize_length
+import numpy as np
+import scipy as sc
+import scipy.signal
+import scipy.interpolate
+from fractions import Fraction as frac
+from .tsm import hps_tsm
+from .utils import ensure_validity, normalize_length
 
 
-
[docs]def pitch_shift_original(x, n, Fs=22050) -> np.ndarray:
+

+[docs]
+def pitch_shift_original(x, n, Fs=22050) -> np.ndarray:
     """
     Pitch modification algorithm via time-scale modification. The input signal is stretched via TSM and then resampled.
     The code closely follows the Matlab implementation.
@@ -132,7 +131,10 @@ 
Source code for libtsm.pitchshift
     return y

 
 
-
[docs]def pitch_shift(x, p, t_p=None, Fs=22050, order="res-tsm", **kwargs) -> np.ndarray:
+
+

+[docs]
+def pitch_shift(x, p, t_p=None, Fs=22050, order="res-tsm", **kwargs) -> np.ndarray:
     """
     (Non-linear) pitch-shifting via time-scale modification and resampling.
 
@@ -216,6 +218,8 @@ 
Source code for libtsm.pitchshift
         # only keep unique indices
         anchor_points = anchor_points[np.unique(anchor_points[:, 1], return_index=True)[1], :]
 
+        anchor_points = ensure_validity(anchor_points)
+
         # Time-Scale Modification
         y_ps = hps_tsm(y_ps, anchor_points, Fs=Fs, **kwargs)
 
@@ -225,6 +229,8 @@ 
Source code for libtsm.pitchshift
         # only keep unique indices
         anchor_points = anchor_points[np.unique(anchor_points[:, 1], return_index=True)[1], :]
 
+        anchor_points = ensure_validity(anchor_points)
+
         # Time-Scale Modification
         y_tsm = hps_tsm(x, anchor_points, Fs=Fs, **kwargs)
 
@@ -240,6 +246,7 @@ 
Source code for libtsm.pitchshift
 
     return y_ps

 
+
 

 
            

@@ -249,7 +256,7 @@ 
Source code for libtsm.pitchshift
   

 
   

-    
© Copyright 2021, Sebastian Rosenzweig, Simon Schwär, Jonathan Driedger, Meinard Müller.

+    
© Copyright 2021-2026, Sebastian Rosenzweig, Simon Schwär, Jonathan Driedger, Meinard Müller.

   

 
   Built with Sphinx using a
diff --git a/docs/build/html/_modules/libtsm/tsm.html b/docs/build/html/_modules/libtsm/tsm.html
index 40915d2..7410c0c 100644
--- a/docs/build/html/_modules/libtsm/tsm.html
+++ b/docs/build/html/_modules/libtsm/tsm.html
@@ -1,20 +1,20 @@
+
+
 
-
+
 
   
   
-  libtsm.tsm — libtsm 1.1.1 documentation
-      
-      
+  libtsm.tsm — libtsm 1.2.0 documentation
+      
+      
 
   
-  
-  
-        
-        
-        
+      
+      
+      
+      
+      
     
     
      
@@ -32,9 +32,6 @@
             
               
           
-              

-                1.1.1
-              

 

   
     
@@ -85,12 +82,14 @@ 
Source code for libtsm.tsm
 This file is part of libtsm (https://www.audiolabs-erlangen.de/resources/MIR/2021-DAFX-AdaptivePitchShifting)
 """
 
-import numpy as np
-import scipy.interpolate
-from .utils import win, stft, istft, cross_corr, hps, find_peaks
+import numpy as np
+import scipy.interpolate
+from .utils import win, stft, istft, cross_corr, hps, find_peaks
 
 
-
[docs]def pv_tsm(x, alpha, syn_hop=512, win_length=2048, win_beta=1, Fs=22050, zero_pad=0, restore_energy=False,
+

+[docs]
+def pv_tsm(x, alpha, syn_hop=512, win_length=2048, win_beta=1, Fs=22050, zero_pad=0, restore_energy=False,
            fft_shift=False, phase_locking=False) -> np.ndarray:
     """Time scale modification based on a phase vocoder
 
@@ -235,7 +234,10 @@ 
Source code for libtsm.tsm
     return y

 
 
-
[docs]def wsola_tsm(x, alpha, syn_hop=512, win_length=1024, win_beta=2, tol=512) -> np.ndarray:
+
+

+[docs]
+def wsola_tsm(x, alpha, syn_hop=512, win_length=1024, win_beta=2, tol=512) -> np.ndarray:
     """Waveform Similarity Overlap and Add (WSOLA) algorithm that rescales the time-axis of the input signal x
     according to the time-stretch function s without altering the pitch of x.
 
@@ -357,7 +359,10 @@ 
Source code for libtsm.tsm
     return y

 
 
-
[docs]def hps_tsm(x, alpha, Fs=22050, hps_ana_hop=256, hps_win_length=1024, hps_win_beta=2, hps_zero_pad=0,
+
+

+[docs]
+def hps_tsm(x, alpha, Fs=22050, hps_ana_hop=256, hps_win_length=1024, hps_win_beta=2, hps_zero_pad=0,
             hps_fil_len_harm=10, hps_fil_len_perc=10, pv_syn_hop=512, pv_win_length=2048, pv_win_beta=2, pv_zero_pad=0,
             pv_restore_energy=False, pv_fft_shift=False, ola_syn_hop=128, ola_win_length=256, ola_win_beta=2) \
         -> np.ndarray:
@@ -454,7 +459,10 @@ 
Source code for libtsm.tsm
     return y

 
 
-
[docs]def pv_int_tsm(x, alpha, syn_hop=512, win_length=2048, win_beta=2, Fs=22050, zero_pad=-1, restore_energy=False,
+
+

+[docs]
+def pv_int_tsm(x, alpha, syn_hop=512, win_length=2048, win_beta=2, Fs=22050, zero_pad=-1, restore_energy=False,
                fft_shift=True) -> np.ndarray:
     """Phase Vocoder Time scale modification algorithm, that rescales the time-axis of the input signal x
     according to the time-stretch function s without altering the pitch of x. This algorithm is optimized for integer
@@ -545,7 +553,10 @@ 
Source code for libtsm.tsm
     return y

 
 
-
[docs]def two_step_tsm(x, alpha, Fs=22050, order='exact-coarse') -> np.ndarray:
+
+

+[docs]
+def two_step_tsm(x, alpha, Fs=22050, order='exact-coarse') -> np.ndarray:
     """Time Scale Modification algorithm, where the signal is stretched by the integer and decimal part
     of the time stretch function using two different algorithms.
 
@@ -587,6 +598,7 @@ 
Source code for libtsm.tsm
         raise Exception("Invalid order!")
 
     return y

+
 

 
            

@@ -596,7 +608,7 @@ 
Source code for libtsm.tsm
   

 
   

-    
© Copyright 2021, Sebastian Rosenzweig, Simon Schwär, Jonathan Driedger, Meinard Müller.

+    
© Copyright 2021-2026, Sebastian Rosenzweig, Simon Schwär, Jonathan Driedger, Meinard Müller.

   

 
   Built with Sphinx using a
diff --git a/docs/build/html/_modules/libtsm/utils.html b/docs/build/html/_modules/libtsm/utils.html
index 5372fc2..d4dd8bd 100644
--- a/docs/build/html/_modules/libtsm/utils.html
+++ b/docs/build/html/_modules/libtsm/utils.html
@@ -1,20 +1,20 @@
+
+
 
-
+
 
   
   
-  libtsm.utils — libtsm 1.1.1 documentation
-      
-      
+  libtsm.utils — libtsm 1.2.0 documentation
+      
+      
 
   
-  
-  
-        
-        
-        
+      
+      
+      
+      
+      
     
     
      
@@ -32,9 +32,6 @@
             
               
           
-              

-                1.1.1
-              

 

   
     
@@ -85,13 +82,15 @@ 
Source code for libtsm.utils
 This file is part of libtsm (https://www.audiolabs-erlangen.de/resources/MIR/2021-DAFX-AdaptivePitchShifting)
 """
 
-import numpy as np
-import scipy as sc
-import scipy.signal
-from typing import Tuple
+import numpy as np
+import scipy as sc
+import scipy.signal
+from typing import Tuple
 
 
-
[docs]def ensure_validity(alpha, syn_hop=128):
+

+[docs]
+def ensure_validity(alpha, syn_hop=128):
     """Remove points from a sequence of anchor points to ensure a valid TSM input
 
     This function removes any anchor points that lead to a non-monotonous increase of the analysis window and
@@ -110,7 +109,14 @@ 
Source code for libtsm.utils
     """
     d_ana = np.diff(alpha[:,0])
     d_syn = np.diff(alpha[:,1])
-    not_too_steep = np.pad(np.round(d_syn / d_ana) <= syn_hop, (1,0), constant_values=True)
+    # divide considering d_ana = 0
+    ratio = np.divide(d_syn, d_ana, out=np.ones_like(d_syn, dtype=float) * syn_hop + 1, where=(d_ana != 0))
+    not_too_steep = np.pad(np.round(ratio) <= syn_hop, (1,0), constant_values=True)
+
+    # make sure that the last point is retained (and try to remove the second-to-last instead)
+    if not_too_steep[-1] == False:
+        not_too_steep[-2] = False
+        not_too_steep[-1] = True
 
     # call recursively to remove consecutive points that are too steep
     if not np.all(not_too_steep):
@@ -119,7 +125,10 @@ 
Source code for libtsm.utils
         return alpha

 
 
-
[docs]def win(win_len, beta) -> np.ndarray:
+
+

+[docs]
+def win(win_len, beta) -> np.ndarray:
     """
     Generates a sin^beta window.
 
@@ -140,7 +149,10 @@ 
Source code for libtsm.utils
     return w

 
 
-
[docs]def hps(x, ana_hop=256, win_length=1024, win_beta=2, Fs=22050, zero_pad=0, fil_len_harm=10, fil_len_perc=10,
+
+

+[docs]
+def hps(x, ana_hop=256, win_length=1024, win_beta=2, Fs=22050, zero_pad=0, fil_len_harm=10, fil_len_perc=10,
         masking_mode='binary') -> Tuple[np.ndarray, np.ndarray]:
     """
     Harmonic - Percussive separation usign median filters.
@@ -234,7 +246,10 @@ 
Source code for libtsm.utils
     return x_harm, x_perc

 
 
-
[docs]def median_filter(X, filt_len, dim) -> np.ndarray:
+
+

+[docs]
+def median_filter(X, filt_len, dim) -> np.ndarray:
     """
     Median filter implementation.
 
@@ -276,7 +291,10 @@ 
Source code for libtsm.utils
     return Y

 
 
-
[docs]def stft(x, ana_hop=2048, win_length=4096, win_beta=2, Fs=22050, num_of_frames=-1, fft_shift=False, zero_pad=0) -> \
+
+

+[docs]
+def stft(x, ana_hop=2048, win_length=4096, win_beta=2, Fs=22050, num_of_frames=-1, fft_shift=False, zero_pad=0) -> \
         Tuple[np.ndarray, np.ndarray, np.ndarray]:
     """
     Computes the Short-Time Fourier Transform (STFT) of the input audio signal.
@@ -367,7 +385,10 @@ 
Source code for libtsm.utils
     return spec, f, t

 
 
-
[docs]def istft(spec, syn_hop=2048, win_length=4096, win_beta=2, Fs=22050, zero_pad=0, num_of_iter=1, orig_sig_len=-1,
+
+

+[docs]
+def istft(spec, syn_hop=2048, win_length=4096, win_beta=2, Fs=22050, zero_pad=0, num_of_iter=1, orig_sig_len=-1,
           restore_energy=False, fft_shift=False) -> Tuple[np.ndarray, np.ndarray, np.ndarray]:
     """
     Computes the 'inverse' Short Time Fourier Transform, according to the paper "Signal Estimation from Modified
@@ -436,7 +457,10 @@ 
Source code for libtsm.utils
     return y

 
 
-
[docs]def lsee_mstft(X, syn_hop=2048, win_length=4096, win_beta=2, zero_pad=0, restore_energy=0, fft_shift=0) -> np.ndarray:
+
+

+[docs]
+def lsee_mstft(X, syn_hop=2048, win_length=4096, win_beta=2, zero_pad=0, restore_energy=0, fft_shift=0) -> np.ndarray:
     """
     Computes the 'inverse' Short Time Fourier Transform (ISTFT) using the Griffin Lim procedure.
 
@@ -511,7 +535,10 @@ 
Source code for libtsm.utils
     return x

 
 
-
[docs]def find_peaks(X) -> Tuple[np.ndarray, np.ndarray, np.ndarray]:
+
+

+[docs]
+def find_peaks(X) -> Tuple[np.ndarray, np.ndarray, np.ndarray]:
     """
     Finds peaks on spectrum X. An index in X is considered a peak if its value is the largest among its four nearest
     neighbours.
@@ -547,7 +574,10 @@ 
Source code for libtsm.utils
     return peaks, infl_region_start, infl_region_end

 
 
-
[docs]def cross_corr(x, y, win_len) -> np.ndarray:
+
+

+[docs]
+def cross_corr(x, y, win_len) -> np.ndarray:
     """
     Computes cross correlation between signals x and y over a window of size win_len.
 
@@ -579,7 +609,10 @@ 
Source code for libtsm.utils
     return cc

 
 
-
[docs]def normalize_length(xf, length) -> np.ndarray:
+
+

+[docs]
+def normalize_length(xf, length) -> np.ndarray:
     """
     Adjusts the length of signal xf to variable "length".
 
@@ -605,7 +638,10 @@ 
Source code for libtsm.utils
     return y

 
 
-
[docs]def modify_spectral_envelope(x, y, ana_hop=64, win_length=1024, win_beta=1, Fs=22050,  filt_len=24) -> np.ndarray:
+
+

+[docs]
+def modify_spectral_envelope(x, y, ana_hop=64, win_length=1024, win_beta=1, Fs=22050,  filt_len=24) -> np.ndarray:
     """
     Complement to the pitch shifting algorithm, that modifies the formants of the
     pitch-shifted signal to match them with those of the original signal.
@@ -671,7 +707,10 @@ 
Source code for libtsm.utils
     return y_spec_env_x

 
 
-
[docs]def comp_env(X, filt_len) -> np.ndarray:
+
+

+[docs]
+def comp_env(X, filt_len) -> np.ndarray:
     """
     Computes the envelope of a given signal spectrum.
 
@@ -696,6 +735,7 @@ 
Source code for libtsm.utils
     env[env < 0.01] = 0.01
 
     return env

+
 

 
            

@@ -705,7 +745,7 @@ 
Source code for libtsm.utils
   

 
   

-    
© Copyright 2021, Sebastian Rosenzweig, Simon Schwär, Jonathan Driedger, Meinard Müller.

+    
© Copyright 2021-2026, Sebastian Rosenzweig, Simon Schwär, Jonathan Driedger, Meinard Müller.

   

 
   Built with Sphinx using a
diff --git a/docs/build/html/_sources/getting_started.rst.txt b/docs/build/html/_sources/getting_started.rst.txt
index 6a04d45..15398d5 100644
--- a/docs/build/html/_sources/getting_started.rst.txt
+++ b/docs/build/html/_sources/getting_started.rst.txt
@@ -4,7 +4,7 @@ Getting Started
 Installation
 ------------
 
-With Python >= 3.6, you can install ``libtsm`` using the Python package manager pip:
+You can install ``libtsm`` using the Python package manager pip:
 
 .. code-block:: bash
 
diff --git a/docs/build/html/_static/_sphinx_javascript_frameworks_compat.js b/docs/build/html/_static/_sphinx_javascript_frameworks_compat.js
new file mode 100644
index 0000000..8141580
--- /dev/null
+++ b/docs/build/html/_static/_sphinx_javascript_frameworks_compat.js
@@ -0,0 +1,123 @@
+/* Compatability shim for jQuery and underscores.js.
+ *
+ * Copyright Sphinx contributors
+ * Released under the two clause BSD licence
+ */
+
+/**
+ * small helper function to urldecode strings
+ *
+ * See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/decodeURIComponent#Decoding_query_parameters_from_a_URL
+ */
+jQuery.urldecode = function(x) {
+    if (!x) {
+        return x
+    }
+    return decodeURIComponent(x.replace(/\+/g, ' '));
+};
+
+/**
+ * small helper function to urlencode strings
+ */
+jQuery.urlencode = encodeURIComponent;
+
+/**
+ * This function returns the parsed url parameters of the
+ * current request. Multiple values per key are supported,
+ * it will always return arrays of strings for the value parts.
+ */
+jQuery.getQueryParameters = function(s) {
+    if (typeof s === 'undefined')
+        s = document.location.search;
+    var parts = s.substr(s.indexOf('?') + 1).split('&');
+    var result = {};
+    for (var i = 0; i < parts.length; i++) {
+        var tmp = parts[i].split('=', 2);
+        var key = jQuery.urldecode(tmp[0]);
+        var value = jQuery.urldecode(tmp[1]);
+        if (key in result)
+            result[key].push(value);
+        else
+            result[key] = [value];
+    }
+    return result;
+};
+
+/**
+ * highlight a given string on a jquery object by wrapping it in
+ * span elements with the given class name.
+ */
+jQuery.fn.highlightText = function(text, className) {
+    function highlight(node, addItems) {
+        if (node.nodeType === 3) {
+            var val = node.nodeValue;
+            var pos = val.toLowerCase().indexOf(text);
+            if (pos >= 0 &&
+                !jQuery(node.parentNode).hasClass(className) &&
+                !jQuery(node.parentNode).hasClass("nohighlight")) {
+                var span;
+                var isInSVG = jQuery(node).closest("body, svg, foreignObject").is("svg");
+                if (isInSVG) {
+                    span = document.createElementNS("http://www.w3.org/2000/svg", "tspan");
+                } else {
+                    span = document.createElement("span");
+                    span.className = className;
+                }
+                span.appendChild(document.createTextNode(val.substr(pos, text.length)));
+                node.parentNode.insertBefore(span, node.parentNode.insertBefore(
+                    document.createTextNode(val.substr(pos + text.length)),
+                    node.nextSibling));
+                node.nodeValue = val.substr(0, pos);
+                if (isInSVG) {
+                    var rect = document.createElementNS("http://www.w3.org/2000/svg", "rect");
+                    var bbox = node.parentElement.getBBox();
+                    rect.x.baseVal.value = bbox.x;
+                    rect.y.baseVal.value = bbox.y;
+                    rect.width.baseVal.value = bbox.width;
+                    rect.height.baseVal.value = bbox.height;
+                    rect.setAttribute('class', className);
+                    addItems.push({
+                        "parent": node.parentNode,
+                        "target": rect});
+                }
+            }
+        }
+        else if (!jQuery(node).is("button, select, textarea")) {
+            jQuery.each(node.childNodes, function() {
+                highlight(this, addItems);
+            });
+        }
+    }
+    var addItems = [];
+    var result = this.each(function() {
+        highlight(this, addItems);
+    });
+    for (var i = 0; i < addItems.length; ++i) {
+        jQuery(addItems[i].parent).before(addItems[i].target);
+    }
+    return result;
+};
+
+/*
+ * backward compatibility for jQuery.browser
+ * This will be supported until firefox bug is fixed.
+ */
+if (!jQuery.browser) {
+    jQuery.uaMatch = function(ua) {
+        ua = ua.toLowerCase();
+
+        var match = /(chrome)[ \/]([\w.]+)/.exec(ua) ||
+            /(webkit)[ \/]([\w.]+)/.exec(ua) ||
+            /(opera)(?:.*version|)[ \/]([\w.]+)/.exec(ua) ||
+            /(msie) ([\w.]+)/.exec(ua) ||
+            ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([\w.]+)|)/.exec(ua) ||
+            [];
+
+        return {
+            browser: match[ 1 ] || "",
+            version: match[ 2 ] || "0"
+        };
+    };
+    jQuery.browser = {};
+    jQuery.browser[jQuery.uaMatch(navigator.userAgent).browser] = true;
+}
diff --git a/docs/build/html/_static/base-stemmer.js b/docs/build/html/_static/base-stemmer.js
new file mode 100644
index 0000000..e6fa0c4
--- /dev/null
+++ b/docs/build/html/_static/base-stemmer.js
@@ -0,0 +1,476 @@
+// @ts-check
+
+/**@constructor*/
+BaseStemmer = function() {
+    /** @protected */
+    this.current = '';
+    this.cursor = 0;
+    this.limit = 0;
+    this.limit_backward = 0;
+    this.bra = 0;
+    this.ket = 0;
+
+    /**
+     * @param {string} value
+     */
+    this.setCurrent = function(value) {
+        this.current = value;
+        this.cursor = 0;
+        this.limit = this.current.length;
+        this.limit_backward = 0;
+        this.bra = this.cursor;
+        this.ket = this.limit;
+    };
+
+    /**
+     * @return {string}
+     */
+    this.getCurrent = function() {
+        return this.current;
+    };
+
+    /**
+     * @param {BaseStemmer} other
+     */
+    this.copy_from = function(other) {
+        /** @protected */
+        this.current          = other.current;
+        this.cursor           = other.cursor;
+        this.limit            = other.limit;
+        this.limit_backward   = other.limit_backward;
+        this.bra              = other.bra;
+        this.ket              = other.ket;
+    };
+
+    /**
+     * @param {number[]} s
+     * @param {number} min
+     * @param {number} max
+     * @return {boolean}
+     */
+    this.in_grouping = function(s, min, max) {
+        /** @protected */
+        if (this.cursor >= this.limit) return false;
+        var ch = this.current.charCodeAt(this.cursor);
+        if (ch > max || ch < min) return false;
+        ch -= min;
+        if ((s[ch >>> 3] & (0x1 << (ch & 0x7))) == 0) return false;
+        this.cursor++;
+        return true;
+    };
+
+    /**
+     * @param {number[]} s
+     * @param {number} min
+     * @param {number} max
+     * @return {boolean}
+     */
+    this.go_in_grouping = function(s, min, max) {
+        /** @protected */
+        while (this.cursor < this.limit) {
+            var ch = this.current.charCodeAt(this.cursor);
+            if (ch > max || ch < min)
+                return true;
+            ch -= min;
+            if ((s[ch >>> 3] & (0x1 << (ch & 0x7))) == 0)
+                return true;
+            this.cursor++;
+        }
+        return false;
+    };
+
+    /**
+     * @param {number[]} s
+     * @param {number} min
+     * @param {number} max
+     * @return {boolean}
+     */
+    this.in_grouping_b = function(s, min, max) {
+        /** @protected */
+        if (this.cursor <= this.limit_backward) return false;
+        var ch = this.current.charCodeAt(this.cursor - 1);
+        if (ch > max || ch < min) return false;
+        ch -= min;
+        if ((s[ch >>> 3] & (0x1 << (ch & 0x7))) == 0) return false;
+        this.cursor--;
+        return true;
+    };
+
+    /**
+     * @param {number[]} s
+     * @param {number} min
+     * @param {number} max
+     * @return {boolean}
+     */
+    this.go_in_grouping_b = function(s, min, max) {
+        /** @protected */
+        while (this.cursor > this.limit_backward) {
+            var ch = this.current.charCodeAt(this.cursor - 1);
+            if (ch > max || ch < min) return true;
+            ch -= min;
+            if ((s[ch >>> 3] & (0x1 << (ch & 0x7))) == 0) return true;
+            this.cursor--;
+        }
+        return false;
+    };
+
+    /**
+     * @param {number[]} s
+     * @param {number} min
+     * @param {number} max
+     * @return {boolean}
+     */
+    this.out_grouping = function(s, min, max) {
+        /** @protected */
+        if (this.cursor >= this.limit) return false;
+        var ch = this.current.charCodeAt(this.cursor);
+        if (ch > max || ch < min) {
+            this.cursor++;
+            return true;
+        }
+        ch -= min;
+        if ((s[ch >>> 3] & (0X1 << (ch & 0x7))) == 0) {
+            this.cursor++;
+            return true;
+        }
+        return false;
+    };
+
+    /**
+     * @param {number[]} s
+     * @param {number} min
+     * @param {number} max
+     * @return {boolean}
+     */
+    this.go_out_grouping = function(s, min, max) {
+        /** @protected */
+        while (this.cursor < this.limit) {
+            var ch = this.current.charCodeAt(this.cursor);
+            if (ch <= max && ch >= min) {
+                ch -= min;
+                if ((s[ch >>> 3] & (0X1 << (ch & 0x7))) != 0) {
+                    return true;
+                }
+            }
+            this.cursor++;
+        }
+        return false;
+    };
+
+    /**
+     * @param {number[]} s
+     * @param {number} min
+     * @param {number} max
+     * @return {boolean}
+     */
+    this.out_grouping_b = function(s, min, max) {
+        /** @protected */
+        if (this.cursor <= this.limit_backward) return false;
+        var ch = this.current.charCodeAt(this.cursor - 1);
+        if (ch > max || ch < min) {
+            this.cursor--;
+            return true;
+        }
+        ch -= min;
+        if ((s[ch >>> 3] & (0x1 << (ch & 0x7))) == 0) {
+            this.cursor--;
+            return true;
+        }
+        return false;
+    };
+
+    /**
+     * @param {number[]} s
+     * @param {number} min
+     * @param {number} max
+     * @return {boolean}
+     */
+    this.go_out_grouping_b = function(s, min, max) {
+        /** @protected */
+        while (this.cursor > this.limit_backward) {
+            var ch = this.current.charCodeAt(this.cursor - 1);
+            if (ch <= max && ch >= min) {
+                ch -= min;
+                if ((s[ch >>> 3] & (0x1 << (ch & 0x7))) != 0) {
+                    return true;
+                }
+            }
+            this.cursor--;
+        }
+        return false;
+    };
+
+    /**
+     * @param {string} s
+     * @return {boolean}
+     */
+    this.eq_s = function(s)
+    {
+        /** @protected */
+        if (this.limit - this.cursor < s.length) return false;
+        if (this.current.slice(this.cursor, this.cursor + s.length) != s)
+        {
+            return false;
+        }
+        this.cursor += s.length;
+        return true;
+    };
+
+    /**
+     * @param {string} s
+     * @return {boolean}
+     */
+    this.eq_s_b = function(s)
+    {
+        /** @protected */
+        if (this.cursor - this.limit_backward < s.length) return false;
+        if (this.current.slice(this.cursor - s.length, this.cursor) != s)
+        {
+            return false;
+        }
+        this.cursor -= s.length;
+        return true;
+    };
+
+    /**
+     * @param {Among[]} v
+     * @return {number}
+     */
+    this.find_among = function(v)
+    {
+        /** @protected */
+        var i = 0;
+        var j = v.length;
+
+        var c = this.cursor;
+        var l = this.limit;
+
+        var common_i = 0;
+        var common_j = 0;
+
+        var first_key_inspected = false;
+
+        while (true)
+        {
+            var k = i + ((j - i) >>> 1);
+            var diff = 0;
+            var common = common_i < common_j ? common_i : common_j; // smaller
+            // w[0]: string, w[1]: substring_i, w[2]: result, w[3]: function (optional)
+            var w = v[k];
+            var i2;
+            for (i2 = common; i2 < w[0].length; i2++)
+            {
+                if (c + common == l)
+                {
+                    diff = -1;
+                    break;
+                }
+                diff = this.current.charCodeAt(c + common) - w[0].charCodeAt(i2);
+                if (diff != 0) break;
+                common++;
+            }
+            if (diff < 0)
+            {
+                j = k;
+                common_j = common;
+            }
+            else
+            {
+                i = k;
+                common_i = common;
+            }
+            if (j - i <= 1)
+            {
+                if (i > 0) break; // v->s has been inspected
+                if (j == i) break; // only one item in v
+
+                // - but now we need to go round once more to get
+                // v->s inspected. This looks messy, but is actually
+                // the optimal approach.
+
+                if (first_key_inspected) break;
+                first_key_inspected = true;
+            }
+        }
+        do {
+            var w = v[i];
+            if (common_i >= w[0].length)
+            {
+                this.cursor = c + w[0].length;
+                if (w.length < 4) return w[2];
+                var res = w[3](this);
+                this.cursor = c + w[0].length;
+                if (res) return w[2];
+            }
+            i = w[1];
+        } while (i >= 0);
+        return 0;
+    };
+
+    // find_among_b is for backwards processing. Same comments apply
+    /**
+     * @param {Among[]} v
+     * @return {number}
+     */
+    this.find_among_b = function(v)
+    {
+        /** @protected */
+        var i = 0;
+        var j = v.length
+
+        var c = this.cursor;
+        var lb = this.limit_backward;
+
+        var common_i = 0;
+        var common_j = 0;
+
+        var first_key_inspected = false;
+
+        while (true)
+        {
+            var k = i + ((j - i) >> 1);
+            var diff = 0;
+            var common = common_i < common_j ? common_i : common_j;
+            var w = v[k];
+            var i2;
+            for (i2 = w[0].length - 1 - common; i2 >= 0; i2--)
+            {
+                if (c - common == lb)
+                {
+                    diff = -1;
+                    break;
+                }
+                diff = this.current.charCodeAt(c - 1 - common) - w[0].charCodeAt(i2);
+                if (diff != 0) break;
+                common++;
+            }
+            if (diff < 0)
+            {
+                j = k;
+                common_j = common;
+            }
+            else
+            {
+                i = k;
+                common_i = common;
+            }
+            if (j - i <= 1)
+            {
+                if (i > 0) break;
+                if (j == i) break;
+                if (first_key_inspected) break;
+                first_key_inspected = true;
+            }
+        }
+        do {
+            var w = v[i];
+            if (common_i >= w[0].length)
+            {
+                this.cursor = c - w[0].length;
+                if (w.length < 4) return w[2];
+                var res = w[3](this);
+                this.cursor = c - w[0].length;
+                if (res) return w[2];
+            }
+            i = w[1];
+        } while (i >= 0);
+        return 0;
+    };
+
+    /* to replace chars between c_bra and c_ket in this.current by the
+     * chars in s.
+     */
+    /**
+     * @param {number} c_bra
+     * @param {number} c_ket
+     * @param {string} s
+     * @return {number}
+     */
+    this.replace_s = function(c_bra, c_ket, s)
+    {
+        /** @protected */
+        var adjustment = s.length - (c_ket - c_bra);
+        this.current = this.current.slice(0, c_bra) + s + this.current.slice(c_ket);
+        this.limit += adjustment;
+        if (this.cursor >= c_ket) this.cursor += adjustment;
+        else if (this.cursor > c_bra) this.cursor = c_bra;
+        return adjustment;
+    };
+
+    /**
+     * @return {boolean}
+     */
+    this.slice_check = function()
+    {
+        /** @protected */
+        if (this.bra < 0 ||
+            this.bra > this.ket ||
+            this.ket > this.limit ||
+            this.limit > this.current.length)
+        {
+            return false;
+        }
+        return true;
+    };
+
+    /**
+     * @param {number} c_bra
+     * @return {boolean}
+     */
+    this.slice_from = function(s)
+    {
+        /** @protected */
+        var result = false;
+        if (this.slice_check())
+        {
+            this.replace_s(this.bra, this.ket, s);
+            result = true;
+        }
+        return result;
+    };
+
+    /**
+     * @return {boolean}
+     */
+    this.slice_del = function()
+    {
+        /** @protected */
+        return this.slice_from("");
+    };
+
+    /**
+     * @param {number} c_bra
+     * @param {number} c_ket
+     * @param {string} s
+     */
+    this.insert = function(c_bra, c_ket, s)
+    {
+        /** @protected */
+        var adjustment = this.replace_s(c_bra, c_ket, s);
+        if (c_bra <= this.bra) this.bra += adjustment;
+        if (c_bra <= this.ket) this.ket += adjustment;
+    };
+
+    /**
+     * @return {string}
+     */
+    this.slice_to = function()
+    {
+        /** @protected */
+        var result = '';
+        if (this.slice_check())
+        {
+            result = this.current.slice(this.bra, this.ket);
+        }
+        return result;
+    };
+
+    /**
+     * @return {string}
+     */
+    this.assign_to = function()
+    {
+        /** @protected */
+        return this.current.slice(0, this.limit);
+    };
+};
diff --git a/docs/build/html/_static/basic.css b/docs/build/html/_static/basic.css
index aa9df31..4738b2e 100644
--- a/docs/build/html/_static/basic.css
+++ b/docs/build/html/_static/basic.css
@@ -1,12 +1,5 @@
 /*
- * basic.css
- * ~~~~~~~~~
- *
  * Sphinx stylesheet -- basic theme.
- *
- * :copyright: Copyright 2007-2021 by the Sphinx team, see AUTHORS.
- * :license: BSD, see LICENSE for details.
- *
  */
 
 /* -- main layout ----------------------------------------------------------- */
@@ -115,15 +108,11 @@ img {
 /* -- search page ----------------------------------------------------------- */
 
 ul.search {
-    margin: 10px 0 0 20px;
-    padding: 0;
+    margin-top: 10px;
 }
 
 ul.search li {
-    padding: 5px 0 5px 20px;
-    background-image: url(file.png);
-    background-repeat: no-repeat;
-    background-position: 0 7px;
+    padding: 5px 0;
 }
 
 ul.search li a {
@@ -222,7 +211,7 @@ table.modindextable td {
 /* -- general body styles --------------------------------------------------- */
 
 div.body {
-    min-width: 450px;
+    min-width: 360px;
     max-width: 800px;
 }
 
@@ -237,14 +226,8 @@ a.headerlink {
     visibility: hidden;
 }
 
-a.brackets:before,
-span.brackets > a:before{
-    content: "[";
-}
-
-a.brackets:after,
-span.brackets > a:after {
-    content: "]";
+a:visited {
+    color: #551A8B;
 }
 
 h1:hover > a.headerlink,
@@ -335,12 +318,16 @@ p.sidebar-title {
     font-weight: bold;
 }
 
+nav.contents,
+aside.topic,
 div.admonition, div.topic, blockquote {
     clear: left;
 }
 
 /* -- topics ---------------------------------------------------------------- */
 
+nav.contents,
+aside.topic,
 div.topic {
     border: 1px solid #ccc;
     padding: 7px;
@@ -379,6 +366,8 @@ div.body p.centered {
 
 div.sidebar > :last-child,
 aside.sidebar > :last-child,
+nav.contents > :last-child,
+aside.topic > :last-child,
 div.topic > :last-child,
 div.admonition > :last-child {
     margin-bottom: 0;
@@ -386,6 +375,8 @@ div.admonition > :last-child {
 
 div.sidebar::after,
 aside.sidebar::after,
+nav.contents::after,
+aside.topic::after,
 div.topic::after,
 div.admonition::after,
 blockquote::after {
@@ -428,10 +419,6 @@ table.docutils td, table.docutils th {
     border-bottom: 1px solid #aaa;
 }
 
-table.footnote td, table.footnote th {
-    border: 0 !important;
-}
-
 th {
     text-align: left;
     padding-right: 5px;
@@ -615,19 +602,26 @@ ul.simple p {
     margin-bottom: 0;
 }
 
-dl.footnote > dt,
-dl.citation > dt {
+aside.footnote > span,
+div.citation > span {
     float: left;
-    margin-right: 0.5em;
 }
-
-dl.footnote > dd,
-dl.citation > dd {
+aside.footnote > span:last-of-type,
+div.citation > span:last-of-type {
+  padding-right: 0.5em;
+}
+aside.footnote > p {
+  margin-left: 2em;
+}
+div.citation > p {
+  margin-left: 4em;
+}
+aside.footnote > p:last-of-type,
+div.citation > p:last-of-type {
     margin-bottom: 0em;
 }
-
-dl.footnote > dd:after,
-dl.citation > dd:after {
+aside.footnote > p:last-of-type:after,
+div.citation > p:last-of-type:after {
     content: "";
     clear: both;
 }
@@ -644,10 +638,6 @@ dl.field-list > dt {
     padding-right: 5px;
 }
 
-dl.field-list > dt:after {
-    content: ":";
-}
-
 dl.field-list > dd {
     padding-left: 0.5em;
     margin-top: 0em;
@@ -673,6 +663,16 @@ dd {
     margin-left: 30px;
 }
 
+.sig dd {
+    margin-top: 0px;
+    margin-bottom: 0px;
+}
+
+.sig dl {
+    margin-top: 0px;
+    margin-bottom: 0px;
+}
+
 dl > dd:last-child,
 dl > dd:last-child > :last-child {
     margin-bottom: 0;
@@ -731,8 +731,9 @@ dl.glossary dt {
 
 .classifier:before {
     font-style: normal;
-    margin: 0.5em;
+    margin: 0 0.5em;
     content: ":";
+    display: inline-block;
 }
 
 abbr, acronym {
@@ -756,6 +757,7 @@ span.pre {
     -ms-hyphens: none;
     -webkit-hyphens: none;
     hyphens: none;
+    white-space: nowrap;
 }
 
 div[class*="highlight-"] {
@@ -819,7 +821,7 @@ div.code-block-caption code {
 
 table.highlighttable td.linenos,
 span.linenos,
-div.doctest > div.highlight span.gp {  /* gp: Generic.Prompt */
+div.highlight span.gp {  /* gp: Generic.Prompt */
   user-select: none;
   -webkit-user-select: text; /* Safari fallback only */
   -webkit-user-select: none; /* Chrome/Safari */
diff --git a/docs/build/html/_static/css/badge_only.css b/docs/build/html/_static/css/badge_only.css
index e380325..88ba55b 100644
--- a/docs/build/html/_static/css/badge_only.css
+++ b/docs/build/html/_static/css/badge_only.css
@@ -1 +1 @@
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dl:not(.docutils),html.writer-html5 .rst-content dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple){margin-bottom:24px}html.writer-html4 .rst-content dl:not(.docutils)>dt,html.writer-html5 .rst-content dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple)>dt{display:table;margin:6px 0;font-size:90%;line-height:normal;background:#e7f2fa;color:#2980b9;border-top:3px solid #6ab0de;padding:6px;position:relative}html.writer-html4 .rst-content dl:not(.docutils)>dt:before,html.writer-html5 .rst-content dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple)>dt:before{color:#6ab0de}html.writer-html4 .rst-content dl:not(.docutils)>dt .headerlink,html.writer-html5 .rst-content dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple)>dt .headerlink{color:#404040;font-size:100%!important}html.writer-html4 .rst-content dl:not(.docutils) dl:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple)>dt,html.writer-html5 .rst-content dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple) dl:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple)>dt{margin-bottom:6px;border:none;border-left:3px solid #ccc;background:#f0f0f0;color:#555}html.writer-html4 .rst-content dl:not(.docutils) dl:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple)>dt .headerlink,html.writer-html5 .rst-content dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple) dl:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple)>dt .headerlink{color:#404040;font-size:100%!important}html.writer-html4 .rst-content dl:not(.docutils)>dt:first-child,html.writer-html5 .rst-content dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple)>dt:first-child{margin-top:0}html.writer-html4 .rst-content dl:not(.docutils) code.descclassname,html.writer-html4 .rst-content dl:not(.docutils) code.descname,html.writer-html4 .rst-content dl:not(.docutils) tt.descclassname,html.writer-html4 .rst-content dl:not(.docutils) tt.descname,html.writer-html5 .rst-content dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple) code.descclassname,html.writer-html5 .rst-content dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple) code.descname,html.writer-html5 .rst-content dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple) tt.descclassname,html.writer-html5 .rst-content dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple) tt.descname{background-color:transparent;border:none;padding:0;font-size:100%!important}html.writer-html4 .rst-content dl:not(.docutils) code.descname,html.writer-html4 .rst-content dl:not(.docutils) tt.descname,html.writer-html5 .rst-content dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple) code.descname,html.writer-html5 .rst-content dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple) tt.descname{font-weight:700}html.writer-html4 .rst-content dl:not(.docutils) .optional,html.writer-html5 .rst-content dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple) .optional{display:inline-block;padding:0 4px;color:#000;font-weight:700}html.writer-html4 .rst-content dl:not(.docutils) .property,html.writer-html5 .rst-content dl[class]:not(.option-list):not(.field-list):not(.footnote):not(.citation):not(.glossary):not(.simple) 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\ No newline at end of file
diff --git a/docs/build/html/_static/doctools.js b/docs/build/html/_static/doctools.js
index 61ac9d2..807cdb1 100644
--- a/docs/build/html/_static/doctools.js
+++ b/docs/build/html/_static/doctools.js
@@ -1,321 +1,150 @@
 /*
- * doctools.js
- * ~~~~~~~~~~~
- *
- * Sphinx JavaScript utilities for all documentation.
- *
- * :copyright: Copyright 2007-2021 by the Sphinx team, see AUTHORS.
- * :license: BSD, see LICENSE for details.
- *
+ * Base JavaScript utilities for all Sphinx HTML documentation.
  */
-
-/**
- * select a different prefix for underscore
- */
-$u = _.noConflict();
-
-/**
- * make the code below compatible with browsers without
- * an installed firebug like debugger
-if (!window.console || !console.firebug) {
-  var names = ["log", "debug", "info", "warn", "error", "assert", "dir",
-    "dirxml", "group", "groupEnd", "time", "timeEnd", "count", "trace",
-    "profile", "profileEnd"];
-  window.console = {};
-  for (var i = 0; i < names.length; ++i)
-    window.console[names[i]] = function() {};
-}
- */
-
-/**
- * small helper function to urldecode strings
- *
- * See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/decodeURIComponent#Decoding_query_parameters_from_a_URL
- */
-jQuery.urldecode = function(x) {
-  if (!x) {
-    return x
-  }
-  return decodeURIComponent(x.replace(/\+/g, ' '));
-};
-
-/**
- * small helper function to urlencode strings
- */
-jQuery.urlencode = encodeURIComponent;
-
-/**
- * This function returns the parsed url parameters of the
- * current request. Multiple values per key are supported,
- * it will always return arrays of strings for the value parts.
- */
-jQuery.getQueryParameters = function(s) {
-  if (typeof s === 'undefined')
-    s = document.location.search;
-  var parts = s.substr(s.indexOf('?') + 1).split('&');
-  var result = {};
-  for (var i = 0; i < parts.length; i++) {
-    var tmp = parts[i].split('=', 2);
-    var key = jQuery.urldecode(tmp[0]);
-    var value = jQuery.urldecode(tmp[1]);
-    if (key in result)
-      result[key].push(value);
-    else
-      result[key] = [value];
+"use strict";
+
+const BLACKLISTED_KEY_CONTROL_ELEMENTS = new Set([
+  "TEXTAREA",
+  "INPUT",
+  "SELECT",
+  "BUTTON",
+]);
+
+const _ready = (callback) => {
+  if (document.readyState !== "loading") {
+    callback();
+  } else {
+    document.addEventListener("DOMContentLoaded", callback);
   }
-  return result;
 };
 
-/**
- * highlight a given string on a jquery object by wrapping it in
- * span elements with the given class name.
- */
-jQuery.fn.highlightText = function(text, className) {
-  function highlight(node, addItems) {
-    if (node.nodeType === 3) {
-      var val = node.nodeValue;
-      var pos = val.toLowerCase().indexOf(text);
-      if (pos >= 0 &&
-          !jQuery(node.parentNode).hasClass(className) &&
-          !jQuery(node.parentNode).hasClass("nohighlight")) {
-        var span;
-        var isInSVG = jQuery(node).closest("body, svg, foreignObject").is("svg");
-        if (isInSVG) {
-          span = document.createElementNS("http://www.w3.org/2000/svg", "tspan");
-        } else {
-          span = document.createElement("span");
-          span.className = className;
-        }
-        span.appendChild(document.createTextNode(val.substr(pos, text.length)));
-        node.parentNode.insertBefore(span, node.parentNode.insertBefore(
-          document.createTextNode(val.substr(pos + text.length)),
-          node.nextSibling));
-        node.nodeValue = val.substr(0, pos);
-        if (isInSVG) {
-          var rect = document.createElementNS("http://www.w3.org/2000/svg", "rect");
-          var bbox = node.parentElement.getBBox();
-          rect.x.baseVal.value = bbox.x;
-          rect.y.baseVal.value = bbox.y;
-          rect.width.baseVal.value = bbox.width;
-          rect.height.baseVal.value = bbox.height;
-          rect.setAttribute('class', className);
-          addItems.push({
-              "parent": node.parentNode,
-              "target": rect});
-        }
-      }
-    }
-    else if (!jQuery(node).is("button, select, textarea")) {
-      jQuery.each(node.childNodes, function() {
-        highlight(this, addItems);
-      });
-    }
-  }
-  var addItems = [];
-  var result = this.each(function() {
-    highlight(this, addItems);
-  });
-  for (var i = 0; i < addItems.length; ++i) {
-    jQuery(addItems[i].parent).before(addItems[i].target);
-  }
-  return result;
-};
-
-/*
- * backward compatibility for jQuery.browser
- * This will be supported until firefox bug is fixed.
- */
-if (!jQuery.browser) {
-  jQuery.uaMatch = function(ua) {
-    ua = ua.toLowerCase();
-
-    var match = /(chrome)[ \/]([\w.]+)/.exec(ua) ||
-      /(webkit)[ \/]([\w.]+)/.exec(ua) ||
-      /(opera)(?:.*version|)[ \/]([\w.]+)/.exec(ua) ||
-      /(msie) ([\w.]+)/.exec(ua) ||
-      ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([\w.]+)|)/.exec(ua) ||
-      [];
-
-    return {
-      browser: match[ 1 ] || "",
-      version: match[ 2 ] || "0"
-    };
-  };
-  jQuery.browser = {};
-  jQuery.browser[jQuery.uaMatch(navigator.userAgent).browser] = true;
-}
-
 /**
  * Small JavaScript module for the documentation.
  */
-var Documentation = {
-
-  init : function() {
-    this.fixFirefoxAnchorBug();
-    this.highlightSearchWords();
-    this.initIndexTable();
-    if (DOCUMENTATION_OPTIONS.NAVIGATION_WITH_KEYS) {
-      this.initOnKeyListeners();
-    }
+const Documentation = {
+  init: () => {
+    Documentation.initDomainIndexTable();
+    Documentation.initOnKeyListeners();
   },
 
   /**
    * i18n support
    */
-  TRANSLATIONS : {},
-  PLURAL_EXPR : function(n) { return n === 1 ? 0 : 1; },
-  LOCALE : 'unknown',
+  TRANSLATIONS: {},
+  PLURAL_EXPR: (n) => (n === 1 ? 0 : 1),
+  LOCALE: "unknown",
 
   // gettext and ngettext don't access this so that the functions
   // can safely bound to a different name (_ = Documentation.gettext)
-  gettext : function(string) {
-    var translated = Documentation.TRANSLATIONS[string];
-    if (typeof translated === 'undefined')
-      return string;
-    return (typeof translated === 'string') ? translated : translated[0];
+  gettext: (string) => {
+    const translated = Documentation.TRANSLATIONS[string];
+    switch (typeof translated) {
+      case "undefined":
+        return string; // no translation
+      case "string":
+        return translated; // translation exists
+      default:
+        return translated[0]; // (singular, plural) translation tuple exists
+    }
   },
 
-  ngettext : function(singular, plural, n) {
-    var translated = Documentation.TRANSLATIONS[singular];
-    if (typeof translated === 'undefined')
-      return (n == 1) ? singular : plural;
-    return translated[Documentation.PLURALEXPR(n)];
+  ngettext: (singular, plural, n) => {
+    const translated = Documentation.TRANSLATIONS[singular];
+    if (typeof translated !== "undefined")
+      return translated[Documentation.PLURAL_EXPR(n)];
+    return n === 1 ? singular : plural;
   },
 
-  addTranslations : function(catalog) {
-    for (var key in catalog.messages)
-      this.TRANSLATIONS[key] = catalog.messages[key];
-    this.PLURAL_EXPR = new Function('n', 'return +(' + catalog.plural_expr + ')');
-    this.LOCALE = catalog.locale;
+  addTranslations: (catalog) => {
+    Object.assign(Documentation.TRANSLATIONS, catalog.messages);
+    Documentation.PLURAL_EXPR = new Function(
+      "n",
+      `return (${catalog.plural_expr})`,
+    );
+    Documentation.LOCALE = catalog.locale;
   },
 
   /**
-   * add context elements like header anchor links
+   * helper function to focus on search bar
    */
-  addContextElements : function() {
-    $('div[id] > :header:first').each(function() {
-      $('\u00B6').
-      attr('href', '#' + this.id).
-      attr('title', _('Permalink to this headline')).
-      appendTo(this);
-    });
-    $('dt[id]').each(function() {
-      $('\u00B6').
-      attr('href', '#' + this.id).
-      attr('title', _('Permalink to this definition')).
-      appendTo(this);
-    });
+  focusSearchBar: () => {
+    document.querySelectorAll("input[name=q]")[0]?.focus();
   },
 
   /**
-   * workaround a firefox stupidity
-   * see: https://bugzilla.mozilla.org/show_bug.cgi?id=645075
+   * Initialise the domain index toggle buttons
    */
-  fixFirefoxAnchorBug : function() {
-    if (document.location.hash && $.browser.mozilla)
-      window.setTimeout(function() {
-        document.location.href += '';
-      }, 10);
-  },
-
-  /**
-   * highlight the search words provided in the url in the text
-   */
-  highlightSearchWords : function() {
-    var params = $.getQueryParameters();
-    var terms = (params.highlight) ? params.highlight[0].split(/\s+/) : [];
-    if (terms.length) {
-      var body = $('div.body');
-      if (!body.length) {
-        body = $('body');
+  initDomainIndexTable: () => {
+    const toggler = (el) => {
+      const idNumber = el.id.substr(7);
+      const toggledRows = document.querySelectorAll(`tr.cg-${idNumber}`);
+      if (el.src.substr(-9) === "minus.png") {
+        el.src = `${el.src.substr(0, el.src.length - 9)}plus.png`;
+        toggledRows.forEach((el) => (el.style.display = "none"));
+      } else {
+        el.src = `${el.src.substr(0, el.src.length - 8)}minus.png`;
+        toggledRows.forEach((el) => (el.style.display = ""));
       }
-      window.setTimeout(function() {
-        $.each(terms, function() {
-          body.highlightText(this.toLowerCase(), 'highlighted');
-        });
-      }, 10);
-      $('
' + _('Hide Search Matches') + '
')
-          .appendTo($('#searchbox'));
-    }
-  },
-
-  /**
-   * init the domain index toggle buttons
-   */
-  initIndexTable : function() {
-    var togglers = $('img.toggler').click(function() {
-      var src = $(this).attr('src');
-      var idnum = $(this).attr('id').substr(7);
-      $('tr.cg-' + idnum).toggle();
-      if (src.substr(-9) === 'minus.png')
-        $(this).attr('src', src.substr(0, src.length-9) + 'plus.png');
-      else
-        $(this).attr('src', src.substr(0, src.length-8) + 'minus.png');
-    }).css('display', '');
-    if (DOCUMENTATION_OPTIONS.COLLAPSE_INDEX) {
-        togglers.click();
-    }
-  },
-
-  /**
-   * helper function to hide the search marks again
-   */
-  hideSearchWords : function() {
-    $('#searchbox .highlight-link').fadeOut(300);
-    $('span.highlighted').removeClass('highlighted');
-  },
-
-  /**
-   * make the url absolute
-   */
-  makeURL : function(relativeURL) {
-    return DOCUMENTATION_OPTIONS.URL_ROOT + '/' + relativeURL;
-  },
+    };
 
-  /**
-   * get the current relative url
-   */
-  getCurrentURL : function() {
-    var path = document.location.pathname;
-    var parts = path.split(/\//);
-    $.each(DOCUMENTATION_OPTIONS.URL_ROOT.split(/\//), function() {
-      if (this === '..')
-        parts.pop();
-    });
-    var url = parts.join('/');
-    return path.substring(url.lastIndexOf('/') + 1, path.length - 1);
+    const togglerElements = document.querySelectorAll("img.toggler");
+    togglerElements.forEach((el) =>
+      el.addEventListener("click", (event) => toggler(event.currentTarget)),
+    );
+    togglerElements.forEach((el) => (el.style.display = ""));
+    if (DOCUMENTATION_OPTIONS.COLLAPSE_INDEX) togglerElements.forEach(toggler);
   },
 
-  initOnKeyListeners: function() {
-    $(document).keydown(function(event) {
-      var activeElementType = document.activeElement.tagName;
-      // don't navigate when in search box, textarea, dropdown or button
-      if (activeElementType !== 'TEXTAREA' && activeElementType !== 'INPUT' && activeElementType !== 'SELECT'
-          && activeElementType !== 'BUTTON' && !event.altKey && !event.ctrlKey && !event.metaKey
-          && !event.shiftKey) {
-        switch (event.keyCode) {
-          case 37: // left
-            var prevHref = $('link[rel="prev"]').prop('href');
-            if (prevHref) {
-              window.location.href = prevHref;
-              return false;
+  initOnKeyListeners: () => {
+    // only install a listener if it is really needed
+    if (
+      !DOCUMENTATION_OPTIONS.NAVIGATION_WITH_KEYS
+      && !DOCUMENTATION_OPTIONS.ENABLE_SEARCH_SHORTCUTS
+    )
+      return;
+
+    document.addEventListener("keydown", (event) => {
+      // bail for input elements
+      if (BLACKLISTED_KEY_CONTROL_ELEMENTS.has(document.activeElement.tagName))
+        return;
+      // bail with special keys
+      if (event.altKey || event.ctrlKey || event.metaKey) return;
+
+      if (!event.shiftKey) {
+        switch (event.key) {
+          case "ArrowLeft":
+            if (!DOCUMENTATION_OPTIONS.NAVIGATION_WITH_KEYS) break;
+
+            const prevLink = document.querySelector('link[rel="prev"]');
+            if (prevLink && prevLink.href) {
+              window.location.href = prevLink.href;
+              event.preventDefault();
             }
-          case 39: // right
-            var nextHref = $('link[rel="next"]').prop('href');
-            if (nextHref) {
-              window.location.href = nextHref;
-              return false;
+            break;
+          case "ArrowRight":
+            if (!DOCUMENTATION_OPTIONS.NAVIGATION_WITH_KEYS) break;
+
+            const nextLink = document.querySelector('link[rel="next"]');
+            if (nextLink && nextLink.href) {
+              window.location.href = nextLink.href;
+              event.preventDefault();
             }
+            break;
         }
       }
+
+      // some keyboard layouts may need Shift to get /
+      switch (event.key) {
+        case "/":
+          if (!DOCUMENTATION_OPTIONS.ENABLE_SEARCH_SHORTCUTS) break;
+          Documentation.focusSearchBar();
+          event.preventDefault();
+      }
     });
-  }
+  },
 };
 
 // quick alias for translations
-_ = Documentation.gettext;
+const _ = Documentation.gettext;
 
-$(document).ready(function() {
-  Documentation.init();
-});
+_ready(Documentation.init);
diff --git a/docs/build/html/_static/documentation_options.js b/docs/build/html/_static/documentation_options.js
index b283bb6..3f42394 100644
--- a/docs/build/html/_static/documentation_options.js
+++ b/docs/build/html/_static/documentation_options.js
@@ -1,12 +1,13 @@
-var DOCUMENTATION_OPTIONS = {
-    URL_ROOT: document.getElementById("documentation_options").getAttribute('data-url_root'),
-    VERSION: '1.1.1',
-    LANGUAGE: 'None',
+const DOCUMENTATION_OPTIONS = {
+    VERSION: '1.2.0',
+    LANGUAGE: 'en',
     COLLAPSE_INDEX: false,
     BUILDER: 'html',
     FILE_SUFFIX: '.html',
     LINK_SUFFIX: '.html',
     HAS_SOURCE: true,
     SOURCELINK_SUFFIX: '.txt',
-    NAVIGATION_WITH_KEYS: false
+    NAVIGATION_WITH_KEYS: false,
+    SHOW_SEARCH_SUMMARY: true,
+    ENABLE_SEARCH_SHORTCUTS: true,
 };
\ No newline at end of file
diff --git a/docs/build/html/_static/english-stemmer.js b/docs/build/html/_static/english-stemmer.js
new file mode 100644
index 0000000..056760e
--- /dev/null
+++ b/docs/build/html/_static/english-stemmer.js
@@ -0,0 +1,1066 @@
+// Generated from english.sbl by Snowball 3.0.1 - https://snowballstem.org/
+
+/**@constructor*/
+var EnglishStemmer = function() {
+    var base = new BaseStemmer();
+
+    /** @const */ var a_0 = [
+        ["arsen", -1, -1],
+        ["commun", -1, -1],
+        ["emerg", -1, -1],
+        ["gener", -1, -1],
+        ["later", -1, -1],
+        ["organ", -1, -1],
+        ["past", -1, -1],
+        ["univers", -1, -1]
+    ];
+
+    /** @const */ var a_1 = [
+        ["'", -1, 1],
+        ["'s'", 0, 1],
+        ["'s", -1, 1]
+    ];
+
+    /** @const */ var a_2 = [
+        ["ied", -1, 2],
+        ["s", -1, 3],
+        ["ies", 1, 2],
+        ["sses", 1, 1],
+        ["ss", 1, -1],
+        ["us", 1, -1]
+    ];
+
+    /** @const */ var a_3 = [
+        ["succ", -1, 1],
+        ["proc", -1, 1],
+        ["exc", -1, 1]
+    ];
+
+    /** @const */ var a_4 = [
+        ["even", -1, 2],
+        ["cann", -1, 2],
+        ["inn", -1, 2],
+        ["earr", -1, 2],
+        ["herr", -1, 2],
+        ["out", -1, 2],
+        ["y", -1, 1]
+    ];
+
+    /** @const */ var a_5 = [
+        ["", -1, -1],
+        ["ed", 0, 2],
+        ["eed", 1, 1],
+        ["ing", 0, 3],
+        ["edly", 0, 2],
+        ["eedly", 4, 1],
+        ["ingly", 0, 2]
+    ];
+
+    /** @const */ var a_6 = [
+        ["", -1, 3],
+        ["bb", 0, 2],
+        ["dd", 0, 2],
+        ["ff", 0, 2],
+        ["gg", 0, 2],
+        ["bl", 0, 1],
+        ["mm", 0, 2],
+        ["nn", 0, 2],
+        ["pp", 0, 2],
+        ["rr", 0, 2],
+        ["at", 0, 1],
+        ["tt", 0, 2],
+        ["iz", 0, 1]
+    ];
+
+    /** @const */ var a_7 = [
+        ["anci", -1, 3],
+        ["enci", -1, 2],
+        ["ogi", -1, 14],
+        ["li", -1, 16],
+        ["bli", 3, 12],
+        ["abli", 4, 4],
+        ["alli", 3, 8],
+        ["fulli", 3, 9],
+        ["lessli", 3, 15],
+        ["ousli", 3, 10],
+        ["entli", 3, 5],
+        ["aliti", -1, 8],
+        ["biliti", -1, 12],
+        ["iviti", -1, 11],
+        ["tional", -1, 1],
+        ["ational", 14, 7],
+        ["alism", -1, 8],
+        ["ation", -1, 7],
+        ["ization", 17, 6],
+        ["izer", -1, 6],
+        ["ator", -1, 7],
+        ["iveness", -1, 11],
+        ["fulness", -1, 9],
+        ["ousness", -1, 10],
+        ["ogist", -1, 13]
+    ];
+
+    /** @const */ var a_8 = [
+        ["icate", -1, 4],
+        ["ative", -1, 6],
+        ["alize", -1, 3],
+        ["iciti", -1, 4],
+        ["ical", -1, 4],
+        ["tional", -1, 1],
+        ["ational", 5, 2],
+        ["ful", -1, 5],
+        ["ness", -1, 5]
+    ];
+
+    /** @const */ var a_9 = [
+        ["ic", -1, 1],
+        ["ance", -1, 1],
+        ["ence", -1, 1],
+        ["able", -1, 1],
+        ["ible", -1, 1],
+        ["ate", -1, 1],
+        ["ive", -1, 1],
+        ["ize", -1, 1],
+        ["iti", -1, 1],
+        ["al", -1, 1],
+        ["ism", -1, 1],
+        ["ion", -1, 2],
+        ["er", -1, 1],
+        ["ous", -1, 1],
+        ["ant", -1, 1],
+        ["ent", -1, 1],
+        ["ment", 15, 1],
+        ["ement", 16, 1]
+    ];
+
+    /** @const */ var a_10 = [
+        ["e", -1, 1],
+        ["l", -1, 2]
+    ];
+
+    /** @const */ var a_11 = [
+        ["andes", -1, -1],
+        ["atlas", -1, -1],
+        ["bias", -1, -1],
+        ["cosmos", -1, -1],
+        ["early", -1, 5],
+        ["gently", -1, 3],
+        ["howe", -1, -1],
+        ["idly", -1, 2],
+        ["news", -1, -1],
+        ["only", -1, 6],
+        ["singly", -1, 7],
+        ["skies", -1, 1],
+        ["sky", -1, -1],
+        ["ugly", -1, 4]
+    ];
+
+    /** @const */ var /** Array */ g_aeo = [17, 64];
+
+    /** @const */ var /** Array */ g_v = [17, 65, 16, 1];
+
+    /** @const */ var /** Array */ g_v_WXY = [1, 17, 65, 208, 1];
+
+    /** @const */ var /** Array */ g_valid_LI = [55, 141, 2];
+
+    var /** boolean */ B_Y_found = false;
+    var /** number */ I_p2 = 0;
+    var /** number */ I_p1 = 0;
+
+
+    /** @return {boolean} */
+    function r_prelude() {
+        B_Y_found = false;
+        /** @const */ var /** number */ v_1 = base.cursor;
+        lab0: {
+            base.bra = base.cursor;
+            if (!(base.eq_s("'")))
+            {
+                break lab0;
+            }
+            base.ket = base.cursor;
+            if (!base.slice_del())
+            {
+                return false;
+            }
+        }
+        base.cursor = v_1;
+        /** @const */ var /** number */ v_2 = base.cursor;
+        lab1: {
+            base.bra = base.cursor;
+            if (!(base.eq_s("y")))
+            {
+                break lab1;
+            }
+            base.ket = base.cursor;
+            if (!base.slice_from("Y"))
+            {
+                return false;
+            }
+            B_Y_found = true;
+        }
+        base.cursor = v_2;
+        /** @const */ var /** number */ v_3 = base.cursor;
+        lab2: {
+            while(true)
+            {
+                /** @const */ var /** number */ v_4 = base.cursor;
+                lab3: {
+                    golab4: while(true)
+                    {
+                        /** @const */ var /** number */ v_5 = base.cursor;
+                        lab5: {
+                            if (!(base.in_grouping(g_v, 97, 121)))
+                            {
+                                break lab5;
+                            }
+                            base.bra = base.cursor;
+                            if (!(base.eq_s("y")))
+                            {
+                                break lab5;
+                            }
+                            base.ket = base.cursor;
+                            base.cursor = v_5;
+                            break golab4;
+                        }
+                        base.cursor = v_5;
+                        if (base.cursor >= base.limit)
+                        {
+                            break lab3;
+                        }
+                        base.cursor++;
+                    }
+                    if (!base.slice_from("Y"))
+                    {
+                        return false;
+                    }
+                    B_Y_found = true;
+                    continue;
+                }
+                base.cursor = v_4;
+                break;
+            }
+        }
+        base.cursor = v_3;
+        return true;
+    };
+
+    /** @return {boolean} */
+    function r_mark_regions() {
+        I_p1 = base.limit;
+        I_p2 = base.limit;
+        /** @const */ var /** number */ v_1 = base.cursor;
+        lab0: {
+            lab1: {
+                /** @const */ var /** number */ v_2 = base.cursor;
+                lab2: {
+                    if (base.find_among(a_0) == 0)
+                    {
+                        break lab2;
+                    }
+                    break lab1;
+                }
+                base.cursor = v_2;
+                if (!base.go_out_grouping(g_v, 97, 121))
+                {
+                    break lab0;
+                }
+                base.cursor++;
+                if (!base.go_in_grouping(g_v, 97, 121))
+                {
+                    break lab0;
+                }
+                base.cursor++;
+            }
+            I_p1 = base.cursor;
+            if (!base.go_out_grouping(g_v, 97, 121))
+            {
+                break lab0;
+            }
+            base.cursor++;
+            if (!base.go_in_grouping(g_v, 97, 121))
+            {
+                break lab0;
+            }
+            base.cursor++;
+            I_p2 = base.cursor;
+        }
+        base.cursor = v_1;
+        return true;
+    };
+
+    /** @return {boolean} */
+    function r_shortv() {
+        lab0: {
+            /** @const */ var /** number */ v_1 = base.limit - base.cursor;
+            lab1: {
+                if (!(base.out_grouping_b(g_v_WXY, 89, 121)))
+                {
+                    break lab1;
+                }
+                if (!(base.in_grouping_b(g_v, 97, 121)))
+                {
+                    break lab1;
+                }
+                if (!(base.out_grouping_b(g_v, 97, 121)))
+                {
+                    break lab1;
+                }
+                break lab0;
+            }
+            base.cursor = base.limit - v_1;
+            lab2: {
+                if (!(base.out_grouping_b(g_v, 97, 121)))
+                {
+                    break lab2;
+                }
+                if (!(base.in_grouping_b(g_v, 97, 121)))
+                {
+                    break lab2;
+                }
+                if (base.cursor > base.limit_backward)
+                {
+                    break lab2;
+                }
+                break lab0;
+            }
+            base.cursor = base.limit - v_1;
+            if (!(base.eq_s_b("past")))
+            {
+                return false;
+            }
+        }
+        return true;
+    };
+
+    /** @return {boolean} */
+    function r_R1() {
+        return I_p1 <= base.cursor;
+    };
+
+    /** @return {boolean} */
+    function r_R2() {
+        return I_p2 <= base.cursor;
+    };
+
+    /** @return {boolean} */
+    function r_Step_1a() {
+        var /** number */ among_var;
+        /** @const */ var /** number */ v_1 = base.limit - base.cursor;
+        lab0: {
+            base.ket = base.cursor;
+            if (base.find_among_b(a_1) == 0)
+            {
+                base.cursor = base.limit - v_1;
+                break lab0;
+            }
+            base.bra = base.cursor;
+            if (!base.slice_del())
+            {
+                return false;
+            }
+        }
+        base.ket = base.cursor;
+        among_var = base.find_among_b(a_2);
+        if (among_var == 0)
+        {
+            return false;
+        }
+        base.bra = base.cursor;
+        switch (among_var) {
+            case 1:
+                if (!base.slice_from("ss"))
+                {
+                    return false;
+                }
+                break;
+            case 2:
+                lab1: {
+                    /** @const */ var /** number */ v_2 = base.limit - base.cursor;
+                    lab2: {
+                        {
+                            /** @const */ var /** number */ c1 = base.cursor - 2;
+                            if (c1 < base.limit_backward)
+                            {
+                                break lab2;
+                            }
+                            base.cursor = c1;
+                        }
+                        if (!base.slice_from("i"))
+                        {
+                            return false;
+                        }
+                        break lab1;
+                    }
+                    base.cursor = base.limit - v_2;
+                    if (!base.slice_from("ie"))
+                    {
+                        return false;
+                    }
+                }
+                break;
+            case 3:
+                if (base.cursor <= base.limit_backward)
+                {
+                    return false;
+                }
+                base.cursor--;
+                if (!base.go_out_grouping_b(g_v, 97, 121))
+                {
+                    return false;
+                }
+                base.cursor--;
+                if (!base.slice_del())
+                {
+                    return false;
+                }
+                break;
+        }
+        return true;
+    };
+
+    /** @return {boolean} */
+    function r_Step_1b() {
+        var /** number */ among_var;
+        base.ket = base.cursor;
+        among_var = base.find_among_b(a_5);
+        base.bra = base.cursor;
+        lab0: {
+            /** @const */ var /** number */ v_1 = base.limit - base.cursor;
+            lab1: {
+                switch (among_var) {
+                    case 1:
+                        /** @const */ var /** number */ v_2 = base.limit - base.cursor;
+                        lab2: {
+                            lab3: {
+                                /** @const */ var /** number */ v_3 = base.limit - base.cursor;
+                                lab4: {
+                                    if (base.find_among_b(a_3) == 0)
+                                    {
+                                        break lab4;
+                                    }
+                                    if (base.cursor > base.limit_backward)
+                                    {
+                                        break lab4;
+                                    }
+                                    break lab3;
+                                }
+                                base.cursor = base.limit - v_3;
+                                if (!r_R1())
+                                {
+                                    break lab2;
+                                }
+                                if (!base.slice_from("ee"))
+                                {
+                                    return false;
+                                }
+                            }
+                        }
+                        base.cursor = base.limit - v_2;
+                        break;
+                    case 2:
+                        break lab1;
+                    case 3:
+                        among_var = base.find_among_b(a_4);
+                        if (among_var == 0)
+                        {
+                            break lab1;
+                        }
+                        switch (among_var) {
+                            case 1:
+                                /** @const */ var /** number */ v_4 = base.limit - base.cursor;
+                                if (!(base.out_grouping_b(g_v, 97, 121)))
+                                {
+                                    break lab1;
+                                }
+                                if (base.cursor > base.limit_backward)
+                                {
+                                    break lab1;
+                                }
+                                base.cursor = base.limit - v_4;
+                                base.bra = base.cursor;
+                                if (!base.slice_from("ie"))
+                                {
+                                    return false;
+                                }
+                                break;
+                            case 2:
+                                if (base.cursor > base.limit_backward)
+                                {
+                                    break lab1;
+                                }
+                                break;
+                        }
+                        break;
+                }
+                break lab0;
+            }
+            base.cursor = base.limit - v_1;
+            /** @const */ var /** number */ v_5 = base.limit - base.cursor;
+            if (!base.go_out_grouping_b(g_v, 97, 121))
+            {
+                return false;
+            }
+            base.cursor--;
+            base.cursor = base.limit - v_5;
+            if (!base.slice_del())
+            {
+                return false;
+            }
+            base.ket = base.cursor;
+            base.bra = base.cursor;
+            /** @const */ var /** number */ v_6 = base.limit - base.cursor;
+            among_var = base.find_among_b(a_6);
+            switch (among_var) {
+                case 1:
+                    if (!base.slice_from("e"))
+                    {
+                        return false;
+                    }
+                    return false;
+                case 2:
+                    {
+                        /** @const */ var /** number */ v_7 = base.limit - base.cursor;
+                        lab5: {
+                            if (!(base.in_grouping_b(g_aeo, 97, 111)))
+                            {
+                                break lab5;
+                            }
+                            if (base.cursor > base.limit_backward)
+                            {
+                                break lab5;
+                            }
+                            return false;
+                        }
+                        base.cursor = base.limit - v_7;
+                    }
+                    break;
+                case 3:
+                    if (base.cursor != I_p1)
+                    {
+                        return false;
+                    }
+                    /** @const */ var /** number */ v_8 = base.limit - base.cursor;
+                    if (!r_shortv())
+                    {
+                        return false;
+                    }
+                    base.cursor = base.limit - v_8;
+                    if (!base.slice_from("e"))
+                    {
+                        return false;
+                    }
+                    return false;
+            }
+            base.cursor = base.limit - v_6;
+            base.ket = base.cursor;
+            if (base.cursor <= base.limit_backward)
+            {
+                return false;
+            }
+            base.cursor--;
+            base.bra = base.cursor;
+            if (!base.slice_del())
+            {
+                return false;
+            }
+        }
+        return true;
+    };
+
+    /** @return {boolean} */
+    function r_Step_1c() {
+        base.ket = base.cursor;
+        lab0: {
+            /** @const */ var /** number */ v_1 = base.limit - base.cursor;
+            lab1: {
+                if (!(base.eq_s_b("y")))
+                {
+                    break lab1;
+                }
+                break lab0;
+            }
+            base.cursor = base.limit - v_1;
+            if (!(base.eq_s_b("Y")))
+            {
+                return false;
+            }
+        }
+        base.bra = base.cursor;
+        if (!(base.out_grouping_b(g_v, 97, 121)))
+        {
+            return false;
+        }
+        lab2: {
+            if (base.cursor > base.limit_backward)
+            {
+                break lab2;
+            }
+            return false;
+        }
+        if (!base.slice_from("i"))
+        {
+            return false;
+        }
+        return true;
+    };
+
+    /** @return {boolean} */
+    function r_Step_2() {
+        var /** number */ among_var;
+        base.ket = base.cursor;
+        among_var = base.find_among_b(a_7);
+        if (among_var == 0)
+        {
+            return false;
+        }
+        base.bra = base.cursor;
+        if (!r_R1())
+        {
+            return false;
+        }
+        switch (among_var) {
+            case 1:
+                if (!base.slice_from("tion"))
+                {
+                    return false;
+                }
+                break;
+            case 2:
+                if (!base.slice_from("ence"))
+                {
+                    return false;
+                }
+                break;
+            case 3:
+                if (!base.slice_from("ance"))
+                {
+                    return false;
+                }
+                break;
+            case 4:
+                if (!base.slice_from("able"))
+                {
+                    return false;
+                }
+                break;
+            case 5:
+                if (!base.slice_from("ent"))
+                {
+                    return false;
+                }
+                break;
+            case 6:
+                if (!base.slice_from("ize"))
+                {
+                    return false;
+                }
+                break;
+            case 7:
+                if (!base.slice_from("ate"))
+                {
+                    return false;
+                }
+                break;
+            case 8:
+                if (!base.slice_from("al"))
+                {
+                    return false;
+                }
+                break;
+            case 9:
+                if (!base.slice_from("ful"))
+                {
+                    return false;
+                }
+                break;
+            case 10:
+                if (!base.slice_from("ous"))
+                {
+                    return false;
+                }
+                break;
+            case 11:
+                if (!base.slice_from("ive"))
+                {
+                    return false;
+                }
+                break;
+            case 12:
+                if (!base.slice_from("ble"))
+                {
+                    return false;
+                }
+                break;
+            case 13:
+                if (!base.slice_from("og"))
+                {
+                    return false;
+                }
+                break;
+            case 14:
+                if (!(base.eq_s_b("l")))
+                {
+                    return false;
+                }
+                if (!base.slice_from("og"))
+                {
+                    return false;
+                }
+                break;
+            case 15:
+                if (!base.slice_from("less"))
+                {
+                    return false;
+                }
+                break;
+            case 16:
+                if (!(base.in_grouping_b(g_valid_LI, 99, 116)))
+                {
+                    return false;
+                }
+                if (!base.slice_del())
+                {
+                    return false;
+                }
+                break;
+        }
+        return true;
+    };
+
+    /** @return {boolean} */
+    function r_Step_3() {
+        var /** number */ among_var;
+        base.ket = base.cursor;
+        among_var = base.find_among_b(a_8);
+        if (among_var == 0)
+        {
+            return false;
+        }
+        base.bra = base.cursor;
+        if (!r_R1())
+        {
+            return false;
+        }
+        switch (among_var) {
+            case 1:
+                if (!base.slice_from("tion"))
+                {
+                    return false;
+                }
+                break;
+            case 2:
+                if (!base.slice_from("ate"))
+                {
+                    return false;
+                }
+                break;
+            case 3:
+                if (!base.slice_from("al"))
+                {
+                    return false;
+                }
+                break;
+            case 4:
+                if (!base.slice_from("ic"))
+                {
+                    return false;
+                }
+                break;
+            case 5:
+                if (!base.slice_del())
+                {
+                    return false;
+                }
+                break;
+            case 6:
+                if (!r_R2())
+                {
+                    return false;
+                }
+                if (!base.slice_del())
+                {
+                    return false;
+                }
+                break;
+        }
+        return true;
+    };
+
+    /** @return {boolean} */
+    function r_Step_4() {
+        var /** number */ among_var;
+        base.ket = base.cursor;
+        among_var = base.find_among_b(a_9);
+        if (among_var == 0)
+        {
+            return false;
+        }
+        base.bra = base.cursor;
+        if (!r_R2())
+        {
+            return false;
+        }
+        switch (among_var) {
+            case 1:
+                if (!base.slice_del())
+                {
+                    return false;
+                }
+                break;
+            case 2:
+                lab0: {
+                    /** @const */ var /** number */ v_1 = base.limit - base.cursor;
+                    lab1: {
+                        if (!(base.eq_s_b("s")))
+                        {
+                            break lab1;
+                        }
+                        break lab0;
+                    }
+                    base.cursor = base.limit - v_1;
+                    if (!(base.eq_s_b("t")))
+                    {
+                        return false;
+                    }
+                }
+                if (!base.slice_del())
+                {
+                    return false;
+                }
+                break;
+        }
+        return true;
+    };
+
+    /** @return {boolean} */
+    function r_Step_5() {
+        var /** number */ among_var;
+        base.ket = base.cursor;
+        among_var = base.find_among_b(a_10);
+        if (among_var == 0)
+        {
+            return false;
+        }
+        base.bra = base.cursor;
+        switch (among_var) {
+            case 1:
+                lab0: {
+                    lab1: {
+                        if (!r_R2())
+                        {
+                            break lab1;
+                        }
+                        break lab0;
+                    }
+                    if (!r_R1())
+                    {
+                        return false;
+                    }
+                    {
+                        /** @const */ var /** number */ v_1 = base.limit - base.cursor;
+                        lab2: {
+                            if (!r_shortv())
+                            {
+                                break lab2;
+                            }
+                            return false;
+                        }
+                        base.cursor = base.limit - v_1;
+                    }
+                }
+                if (!base.slice_del())
+                {
+                    return false;
+                }
+                break;
+            case 2:
+                if (!r_R2())
+                {
+                    return false;
+                }
+                if (!(base.eq_s_b("l")))
+                {
+                    return false;
+                }
+                if (!base.slice_del())
+                {
+                    return false;
+                }
+                break;
+        }
+        return true;
+    };
+
+    /** @return {boolean} */
+    function r_exception1() {
+        var /** number */ among_var;
+        base.bra = base.cursor;
+        among_var = base.find_among(a_11);
+        if (among_var == 0)
+        {
+            return false;
+        }
+        base.ket = base.cursor;
+        if (base.cursor < base.limit)
+        {
+            return false;
+        }
+        switch (among_var) {
+            case 1:
+                if (!base.slice_from("sky"))
+                {
+                    return false;
+                }
+                break;
+            case 2:
+                if (!base.slice_from("idl"))
+                {
+                    return false;
+                }
+                break;
+            case 3:
+                if (!base.slice_from("gentl"))
+                {
+                    return false;
+                }
+                break;
+            case 4:
+                if (!base.slice_from("ugli"))
+                {
+                    return false;
+                }
+                break;
+            case 5:
+                if (!base.slice_from("earli"))
+                {
+                    return false;
+                }
+                break;
+            case 6:
+                if (!base.slice_from("onli"))
+                {
+                    return false;
+                }
+                break;
+            case 7:
+                if (!base.slice_from("singl"))
+                {
+                    return false;
+                }
+                break;
+        }
+        return true;
+    };
+
+    /** @return {boolean} */
+    function r_postlude() {
+        if (!B_Y_found)
+        {
+            return false;
+        }
+        while(true)
+        {
+            /** @const */ var /** number */ v_1 = base.cursor;
+            lab0: {
+                golab1: while(true)
+                {
+                    /** @const */ var /** number */ v_2 = base.cursor;
+                    lab2: {
+                        base.bra = base.cursor;
+                        if (!(base.eq_s("Y")))
+                        {
+                            break lab2;
+                        }
+                        base.ket = base.cursor;
+                        base.cursor = v_2;
+                        break golab1;
+                    }
+                    base.cursor = v_2;
+                    if (base.cursor >= base.limit)
+                    {
+                        break lab0;
+                    }
+                    base.cursor++;
+                }
+                if (!base.slice_from("y"))
+                {
+                    return false;
+                }
+                continue;
+            }
+            base.cursor = v_1;
+            break;
+        }
+        return true;
+    };
+
+    this.stem = /** @return {boolean} */ function() {
+        lab0: {
+            /** @const */ var /** number */ v_1 = base.cursor;
+            lab1: {
+                if (!r_exception1())
+                {
+                    break lab1;
+                }
+                break lab0;
+            }
+            base.cursor = v_1;
+            lab2: {
+                {
+                    /** @const */ var /** number */ v_2 = base.cursor;
+                    lab3: {
+                        {
+                            /** @const */ var /** number */ c1 = base.cursor + 3;
+                            if (c1 > base.limit)
+                            {
+                                break lab3;
+                            }
+                            base.cursor = c1;
+                        }
+                        break lab2;
+                    }
+                    base.cursor = v_2;
+                }
+                break lab0;
+            }
+            base.cursor = v_1;
+            r_prelude();
+            r_mark_regions();
+            base.limit_backward = base.cursor; base.cursor = base.limit;
+            /** @const */ var /** number */ v_3 = base.limit - base.cursor;
+            r_Step_1a();
+            base.cursor = base.limit - v_3;
+            /** @const */ var /** number */ v_4 = base.limit - base.cursor;
+            r_Step_1b();
+            base.cursor = base.limit - v_4;
+            /** @const */ var /** number */ v_5 = base.limit - base.cursor;
+            r_Step_1c();
+            base.cursor = base.limit - v_5;
+            /** @const */ var /** number */ v_6 = base.limit - base.cursor;
+            r_Step_2();
+            base.cursor = base.limit - v_6;
+            /** @const */ var /** number */ v_7 = base.limit - base.cursor;
+            r_Step_3();
+            base.cursor = base.limit - v_7;
+            /** @const */ var /** number */ v_8 = base.limit - base.cursor;
+            r_Step_4();
+            base.cursor = base.limit - v_8;
+            /** @const */ var /** number */ v_9 = base.limit - base.cursor;
+            r_Step_5();
+            base.cursor = base.limit - v_9;
+            base.cursor = base.limit_backward;
+            /** @const */ var /** number */ v_10 = base.cursor;
+            r_postlude();
+            base.cursor = v_10;
+        }
+        return true;
+    };
+
+    /**@return{string}*/
+    this['stemWord'] = function(/**string*/word) {
+        base.setCurrent(word);
+        this.stem();
+        return base.getCurrent();
+    };
+};
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+        `,
+          )
+          .join("\n")}
+      

+    `;
+    return languagesHTML;
+  }
+
+  function renderVersions(config) {
+    if (!config.versions.active.length) {
+      return "";
+    }
+    const versionsHTML = `
+      

+        
Versions

+        ${config.versions.active
+          .map(
+            (version) => `
+        

+          ${version.slug}
+        

+        `,
+          )
+          .join("\n")}
+      

+    `;
+    return versionsHTML;
+  }
+
+  function renderDownloads(config) {
+    if (!Object.keys(config.versions.current.downloads).length) {
+      return "";
+    }
+    const downloadsNameDisplay = {
+      pdf: "PDF",
+      epub: "Epub",
+      htmlzip: "HTML",
+    };
+
+    const downloadsHTML = `
+      

+        
Downloads

+        ${Object.entries(config.versions.current.downloads)
+          .map(
+            ([name, url]) => `
+          

+            ${downloadsNameDisplay[name]}
+          

+        `,
+          )
+          .join("\n")}
+      

+    `;
+    return downloadsHTML;
+  }
+
+  document.addEventListener("readthedocs-addons-data-ready", function (event) {
+    const config = event.detail.data();
+
+    const flyout = `
+      

+        
+           Read the Docs
+          v: ${config.versions.current.slug}
+          
+        
+        

+          

+            ${renderLanguages(config)}
+            ${renderVersions(config)}
+            ${renderDownloads(config)}
+            

+              
On Read the Docs

+              

+                Project Home
+              

+              

+                Builds
+              

+              

+                Downloads
+              

+            

+            

+              
Search

+              

+                

+                  
+                

+              

+            

+            

+            
+              Hosted by Read the Docs
+            
+          

+        

+    `;
+
+    // Inject the generated flyout into the body HTML element.
+    document.body.insertAdjacentHTML("beforeend", flyout);
+
+    // Trigger the Read the Docs Addons Search modal when clicking on the "Search docs" input from inside the flyout.
+    document
+      .querySelector("#flyout-search-form")
+      .addEventListener("focusin", () => {
+        const event = new CustomEvent("readthedocs-search-show");
+        document.dispatchEvent(event);
+      });
+  })
+}
+
+if (themeLanguageSelector || themeVersionSelector) {
+  function onSelectorSwitch(event) {
+    const option = event.target.selectedIndex;
+    const item = event.target.options[option];
+    window.location.href = item.dataset.url;
+  }
+
+  document.addEventListener("readthedocs-addons-data-ready", function (event) {
+    const config = event.detail.data();
+
+    const versionSwitch = document.querySelector(
+      "div.switch-menus > div.version-switch",
+    );
+    if (themeVersionSelector) {
+      let versions = config.versions.active;
+      if (config.versions.current.hidden || config.versions.current.type === "external") {
+        versions.unshift(config.versions.current);
+      }
+      const versionSelect = `
+    
+  `;
+
+      versionSwitch.innerHTML = versionSelect;
+      versionSwitch.firstElementChild.addEventListener("change", onSelectorSwitch);
+    }
+
+    const languageSwitch = document.querySelector(
+      "div.switch-menus > div.language-switch",
+    );
+
+    if (themeLanguageSelector) {
+      if (config.projects.translations.length) {
+        // Add the current language to the options on the selector
+        let languages = config.projects.translations.concat(
+          config.projects.current,
+        );
+        languages = languages.sort((a, b) =>
+          a.language.name.localeCompare(b.language.name),
+        );
+
+        const languageSelect = `
+      
+    `;
+
+        languageSwitch.innerHTML = languageSelect;
+        languageSwitch.firstElementChild.addEventListener("change", onSelectorSwitch);
+      }
+      else {
+        languageSwitch.remove();
+      }
+    }
+  });
+}
+
+document.addEventListener("readthedocs-addons-data-ready", function (event) {
+  // Trigger the Read the Docs Addons Search modal when clicking on "Search docs" input from the topnav.
+  document
+    .querySelector("[role='search'] input")
+    .addEventListener("focusin", () => {
+      const event = new CustomEvent("readthedocs-search-show");
+      document.dispatchEvent(event);
+    });
+});
\ No newline at end of file
diff --git a/docs/build/html/_static/language_data.js b/docs/build/html/_static/language_data.js
index 863704b..5776786 100644
--- a/docs/build/html/_static/language_data.js
+++ b/docs/build/html/_static/language_data.js
@@ -1,297 +1,13 @@
 /*
- * language_data.js
- * ~~~~~~~~~~~~~~~~
- *
  * This script contains the language-specific data used by searchtools.js,
- * namely the list of stopwords, stemmer, scorer and splitter.
- *
- * :copyright: Copyright 2007-2021 by the Sphinx team, see AUTHORS.
- * :license: BSD, see LICENSE for details.
- *
+ * namely the set of stopwords, stemmer, scorer and splitter.
  */
 
-var stopwords = ["a","and","are","as","at","be","but","by","for","if","in","into","is","it","near","no","not","of","on","or","such","that","the","their","then","there","these","they","this","to","was","will","with"];
-
-
-/* Non-minified version is copied as a separate JS file, is available */
-
-/**
- * Porter Stemmer
- */
-var Stemmer = function() {
-
-  var step2list = {
-    ational: 'ate',
-    tional: 'tion',
-    enci: 'ence',
-    anci: 'ance',
-    izer: 'ize',
-    bli: 'ble',
-    alli: 'al',
-    entli: 'ent',
-    eli: 'e',
-    ousli: 'ous',
-    ization: 'ize',
-    ation: 'ate',
-    ator: 'ate',
-    alism: 'al',
-    iveness: 'ive',
-    fulness: 'ful',
-    ousness: 'ous',
-    aliti: 'al',
-    iviti: 'ive',
-    biliti: 'ble',
-    logi: 'log'
-  };
-
-  var step3list = {
-    icate: 'ic',
-    ative: '',
-    alize: 'al',
-    iciti: 'ic',
-    ical: 'ic',
-    ful: '',
-    ness: ''
-  };
-
-  var c = "[^aeiou]";          // consonant
-  var v = "[aeiouy]";          // vowel
-  var C = c + "[^aeiouy]*";    // consonant sequence
-  var V = v + "[aeiou]*";      // vowel sequence
-
-  var mgr0 = "^(" + C + ")?" + V + C;                      // [C]VC... is m>0
-  var meq1 = "^(" + C + ")?" + V + C + "(" + V + ")?$";    // [C]VC[V] is m=1
-  var mgr1 = "^(" + C + ")?" + V + C + V + C;              // [C]VCVC... is m>1
-  var s_v   = "^(" + C + ")?" + v;                         // vowel in stem
-
-  this.stemWord = function (w) {
-    var stem;
-    var suffix;
-    var firstch;
-    var origword = w;
-
-    if (w.length < 3)
-      return w;
-
-    var re;
-    var re2;
-    var re3;
-    var re4;
-
-    firstch = w.substr(0,1);
-    if (firstch == "y")
-      w = firstch.toUpperCase() + w.substr(1);
-
-    // Step 1a
-    re = /^(.+?)(ss|i)es$/;
-    re2 = /^(.+?)([^s])s$/;
-
-    if (re.test(w))
-      w = w.replace(re,"$1$2");
-    else if (re2.test(w))
-      w = w.replace(re2,"$1$2");
-
-    // Step 1b
-    re = /^(.+?)eed$/;
-    re2 = /^(.+?)(ed|ing)$/;
-    if (re.test(w)) {
-      var fp = re.exec(w);
-      re = new RegExp(mgr0);
-      if (re.test(fp[1])) {
-        re = /.$/;
-        w = w.replace(re,"");
-      }
-    }
-    else if (re2.test(w)) {
-      var fp = re2.exec(w);
-      stem = fp[1];
-      re2 = new RegExp(s_v);
-      if (re2.test(stem)) {
-        w = stem;
-        re2 = /(at|bl|iz)$/;
-        re3 = new RegExp("([^aeiouylsz])\\1$");
-        re4 = new RegExp("^" + C + v + "[^aeiouwxy]$");
-        if (re2.test(w))
-          w = w + "e";
-        else if (re3.test(w)) {
-          re = /.$/;
-          w = w.replace(re,"");
-        }
-        else if (re4.test(w))
-          w = w + "e";
-      }
-    }
-
-    // Step 1c
-    re = /^(.+?)y$/;
-    if (re.test(w)) {
-      var fp = re.exec(w);
-      stem = fp[1];
-      re = new RegExp(s_v);
-      if (re.test(stem))
-        w = stem + "i";
-    }
-
-    // Step 2
-    re = /^(.+?)(ational|tional|enci|anci|izer|bli|alli|entli|eli|ousli|ization|ation|ator|alism|iveness|fulness|ousness|aliti|iviti|biliti|logi)$/;
-    if (re.test(w)) {
-      var fp = re.exec(w);
-      stem = fp[1];
-      suffix = fp[2];
-      re = new RegExp(mgr0);
-      if (re.test(stem))
-        w = stem + step2list[suffix];
-    }
-
-    // Step 3
-    re = /^(.+?)(icate|ative|alize|iciti|ical|ful|ness)$/;
-    if (re.test(w)) {
-      var fp = re.exec(w);
-      stem = fp[1];
-      suffix = fp[2];
-      re = new RegExp(mgr0);
-      if (re.test(stem))
-        w = stem + step3list[suffix];
-    }
-
-    // Step 4
-    re = /^(.+?)(al|ance|ence|er|ic|able|ible|ant|ement|ment|ent|ou|ism|ate|iti|ous|ive|ize)$/;
-    re2 = /^(.+?)(s|t)(ion)$/;
-    if (re.test(w)) {
-      var fp = re.exec(w);
-      stem = fp[1];
-      re = new RegExp(mgr1);
-      if (re.test(stem))
-        w = stem;
-    }
-    else if (re2.test(w)) {
-      var fp = re2.exec(w);
-      stem = fp[1] + fp[2];
-      re2 = new RegExp(mgr1);
-      if (re2.test(stem))
-        w = stem;
-    }
-
-    // Step 5
-    re = /^(.+?)e$/;
-    if (re.test(w)) {
-      var fp = re.exec(w);
-      stem = fp[1];
-      re = new RegExp(mgr1);
-      re2 = new RegExp(meq1);
-      re3 = new RegExp("^" + C + v + "[^aeiouwxy]$");
-      if (re.test(stem) || (re2.test(stem) && !(re3.test(stem))))
-        w = stem;
-    }
-    re = /ll$/;
-    re2 = new RegExp(mgr1);
-    if (re.test(w) && re2.test(w)) {
-      re = /.$/;
-      w = w.replace(re,"");
-    }
-
-    // and turn initial Y back to y
-    if (firstch == "y")
-      w = firstch.toLowerCase() + w.substr(1);
-    return w;
-  }
-}
-
-
-
-
-var splitChars = (function() {
-    var result = {};
-    var singles = [96, 180, 187, 191, 215, 247, 749, 885, 903, 907, 909, 930, 1014, 1648,
-         1748, 1809, 2416, 2473, 2481, 2526, 2601, 2609, 2612, 2615, 2653, 2702,
-         2706, 2729, 2737, 2740, 2857, 2865, 2868, 2910, 2928, 2948, 2961, 2971,
-         2973, 3085, 3089, 3113, 3124, 3213, 3217, 3241, 3252, 3295, 3341, 3345,
-         3369, 3506, 3516, 3633, 3715, 3721, 3736, 3744, 3748, 3750, 3756, 3761,
-         3781, 3912, 4239, 4347, 4681, 4695, 4697, 4745, 4785, 4799, 4801, 4823,
-         4881, 5760, 5901, 5997, 6313, 7405, 8024, 8026, 8028, 8030, 8117, 8125,
-         8133, 8181, 8468, 8485, 8487, 8489, 8494, 8527, 11311, 11359, 11687, 11695,
-         11703, 11711, 11719, 11727, 11735, 12448, 12539, 43010, 43014, 43019, 43587,
-         43696, 43713, 64286, 64297, 64311, 64317, 64319, 64322, 64325, 65141];
-    var i, j, start, end;
-    for (i = 0; i < singles.length; i++) {
-        result[singles[i]] = true;
-    }
-    var ranges = [[0, 47], [58, 64], [91, 94], [123, 169], [171, 177], [182, 184], [706, 709],
-         [722, 735], [741, 747], [751, 879], [888, 889], [894, 901], [1154, 1161],
-         [1318, 1328], [1367, 1368], [1370, 1376], [1416, 1487], [1515, 1519], [1523, 1568],
-         [1611, 1631], [1642, 1645], [1750, 1764], [1767, 1773], [1789, 1790], [1792, 1807],
-         [1840, 1868], [1958, 1968], [1970, 1983], [2027, 2035], [2038, 2041], [2043, 2047],
-         [2070, 2073], [2075, 2083], [2085, 2087], [2089, 2307], [2362, 2364], [2366, 2383],
-         [2385, 2391], [2402, 2405], [2419, 2424], [2432, 2436], [2445, 2446], [2449, 2450],
-         [2483, 2485], [2490, 2492], [2494, 2509], [2511, 2523], [2530, 2533], [2546, 2547],
-         [2554, 2564], [2571, 2574], [2577, 2578], [2618, 2648], [2655, 2661], [2672, 2673],
-         [2677, 2692], [2746, 2748], [2750, 2767], [2769, 2783], [2786, 2789], [2800, 2820],
-         [2829, 2830], [2833, 2834], [2874, 2876], [2878, 2907], [2914, 2917], [2930, 2946],
-         [2955, 2957], [2966, 2968], [2976, 2978], [2981, 2983], [2987, 2989], [3002, 3023],
-         [3025, 3045], [3059, 3076], [3130, 3132], [3134, 3159], [3162, 3167], [3170, 3173],
-         [3184, 3191], [3199, 3204], [3258, 3260], [3262, 3293], [3298, 3301], [3312, 3332],
-         [3386, 3388], [3390, 3423], [3426, 3429], [3446, 3449], [3456, 3460], [3479, 3481],
-         [3518, 3519], [3527, 3584], [3636, 3647], [3655, 3663], [3674, 3712], [3717, 3718],
-         [3723, 3724], [3726, 3731], [3752, 3753], [3764, 3772], [3774, 3775], [3783, 3791],
-         [3802, 3803], [3806, 3839], [3841, 3871], [3892, 3903], [3949, 3975], [3980, 4095],
-         [4139, 4158], [4170, 4175], [4182, 4185], [4190, 4192], [4194, 4196], [4199, 4205],
-         [4209, 4212], [4226, 4237], [4250, 4255], [4294, 4303], [4349, 4351], [4686, 4687],
-         [4702, 4703], [4750, 4751], [4790, 4791], [4806, 4807], [4886, 4887], [4955, 4968],
-         [4989, 4991], [5008, 5023], [5109, 5120], [5741, 5742], [5787, 5791], [5867, 5869],
-         [5873, 5887], [5906, 5919], [5938, 5951], [5970, 5983], [6001, 6015], [6068, 6102],
-         [6104, 6107], [6109, 6111], [6122, 6127], [6138, 6159], [6170, 6175], [6264, 6271],
-         [6315, 6319], [6390, 6399], [6429, 6469], [6510, 6511], [6517, 6527], [6572, 6592],
-         [6600, 6607], [6619, 6655], [6679, 6687], [6741, 6783], [6794, 6799], [6810, 6822],
-         [6824, 6916], [6964, 6980], [6988, 6991], [7002, 7042], [7073, 7085], [7098, 7167],
-         [7204, 7231], [7242, 7244], [7294, 7400], [7410, 7423], [7616, 7679], [7958, 7959],
-         [7966, 7967], [8006, 8007], [8014, 8015], [8062, 8063], [8127, 8129], [8141, 8143],
-         [8148, 8149], [8156, 8159], [8173, 8177], [8189, 8303], [8306, 8307], [8314, 8318],
-         [8330, 8335], [8341, 8449], [8451, 8454], [8456, 8457], [8470, 8472], [8478, 8483],
-         [8506, 8507], [8512, 8516], [8522, 8525], [8586, 9311], [9372, 9449], [9472, 10101],
-         [10132, 11263], [11493, 11498], [11503, 11516], [11518, 11519], [11558, 11567],
-         [11622, 11630], [11632, 11647], [11671, 11679], [11743, 11822], [11824, 12292],
-         [12296, 12320], [12330, 12336], [12342, 12343], [12349, 12352], [12439, 12444],
-         [12544, 12548], [12590, 12592], [12687, 12689], [12694, 12703], [12728, 12783],
-         [12800, 12831], [12842, 12880], [12896, 12927], [12938, 12976], [12992, 13311],
-         [19894, 19967], [40908, 40959], [42125, 42191], [42238, 42239], [42509, 42511],
-         [42540, 42559], [42592, 42593], [42607, 42622], [42648, 42655], [42736, 42774],
-         [42784, 42785], [42889, 42890], [42893, 43002], [43043, 43055], [43062, 43071],
-         [43124, 43137], [43188, 43215], [43226, 43249], [43256, 43258], [43260, 43263],
-         [43302, 43311], [43335, 43359], [43389, 43395], [43443, 43470], [43482, 43519],
-         [43561, 43583], [43596, 43599], [43610, 43615], [43639, 43641], [43643, 43647],
-         [43698, 43700], [43703, 43704], [43710, 43711], [43715, 43738], [43742, 43967],
-         [44003, 44015], [44026, 44031], [55204, 55215], [55239, 55242], [55292, 55295],
-         [57344, 63743], [64046, 64047], [64110, 64111], [64218, 64255], [64263, 64274],
-         [64280, 64284], [64434, 64466], [64830, 64847], [64912, 64913], [64968, 65007],
-         [65020, 65135], [65277, 65295], [65306, 65312], [65339, 65344], [65371, 65381],
-         [65471, 65473], [65480, 65481], [65488, 65489], [65496, 65497]];
-    for (i = 0; i < ranges.length; i++) {
-        start = ranges[i][0];
-        end = ranges[i][1];
-        for (j = start; j <= end; j++) {
-            result[j] = true;
-        }
-    }
-    return result;
-})();
-
-function splitQuery(query) {
-    var result = [];
-    var start = -1;
-    for (var i = 0; i < query.length; i++) {
-        if (splitChars[query.charCodeAt(i)]) {
-            if (start !== -1) {
-                result.push(query.slice(start, i));
-                start = -1;
-            }
-        } else if (start === -1) {
-            start = i;
-        }
-    }
-    if (start !== -1) {
-        result.push(query.slice(start));
-    }
-    return result;
-}
+const stopwords = new Set(["a", "about", "above", "after", "again", "against", "all", "am", "an", "and", "any", "are", "aren't", "as", "at", "be", "because", "been", "before", "being", "below", "between", "both", "but", "by", "can't", "cannot", "could", "couldn't", "did", "didn't", "do", "does", "doesn't", "doing", "don't", "down", "during", "each", "few", "for", "from", "further", "had", "hadn't", "has", "hasn't", "have", "haven't", "having", "he", "he'd", "he'll", "he's", "her", "here", "here's", "hers", "herself", "him", "himself", "his", "how", "how's", "i", "i'd", "i'll", "i'm", "i've", "if", "in", "into", "is", "isn't", "it", "it's", "its", "itself", "let's", "me", "more", "most", "mustn't", "my", "myself", "no", "nor", "not", "of", "off", "on", "once", "only", "or", "other", "ought", "our", "ours", "ourselves", "out", "over", "own", "same", "shan't", "she", "she'd", "she'll", "she's", "should", "shouldn't", "so", "some", "such", "than", "that", "that's", "the", "their", "theirs", "them", "themselves", "then", "there", "there's", "these", "they", "they'd", "they'll", "they're", "they've", "this", "those", "through", "to", "too", "under", "until", "up", "very", "was", "wasn't", "we", "we'd", "we'll", "we're", "we've", "were", "weren't", "what", "what's", "when", "when's", "where", "where's", "which", "while", "who", "who's", "whom", "why", "why's", "with", "won't", "would", "wouldn't", "you", "you'd", "you'll", "you're", "you've", "your", "yours", "yourself", "yourselves"]);
+window.stopwords = stopwords;  // Export to global scope
 
 
+/* Non-minified versions are copied as separate JavaScript files, if available */
+BaseStemmer=function(){this.current="",this.cursor=0,this.limit=0,this.limit_backward=0,this.bra=0,this.ket=0,this.setCurrent=function(t){this.current=t,this.cursor=0,this.limit=this.current.length,this.limit_backward=0,this.bra=this.cursor,this.ket=this.limit},this.getCurrent=function(){return this.current},this.copy_from=function(t){this.current=t.current,this.cursor=t.cursor,this.limit=t.limit,this.limit_backward=t.limit_backward,this.bra=t.bra,this.ket=t.ket},this.in_grouping=function(t,r,i){return!(this.cursor>=this.limit||i<(i=this.current.charCodeAt(this.cursor))||i>>3]&1<<(7&i))||(this.cursor++,0))},this.go_in_grouping=function(t,r,i){for(;this.cursor>>3]&1<<(7&s)))return!0;this.cursor++}return!1},this.in_grouping_b=function(t,r,i){return!(this.cursor<=this.limit_backward||i<(i=this.current.charCodeAt(this.cursor-1))||i>>3]&1<<(7&i))||(this.cursor--,0))},this.go_in_grouping_b=function(t,r,i){for(;this.cursor>this.limit_backward;){var s=this.current.charCodeAt(this.cursor-1);if(i>>3]&1<<(7&s)))return!0;this.cursor--}return!1},this.out_grouping=function(t,r,i){return!(this.cursor>=this.limit)&&(i<(i=this.current.charCodeAt(this.cursor))||i>>3]&1<<(7&i)))&&(this.cursor++,!0)},this.go_out_grouping=function(t,r,i){for(;this.cursor>>3]&1<<(7&s)))return!0;this.cursor++}return!1},this.out_grouping_b=function(t,r,i){return!(this.cursor<=this.limit_backward)&&(i<(i=this.current.charCodeAt(this.cursor-1))||i>>3]&1<<(7&i)))&&(this.cursor--,!0)},this.go_out_grouping_b=function(t,r,i){for(;this.cursor>this.limit_backward;){var s=this.current.charCodeAt(this.cursor-1);if(s<=i&&r<=s&&0!=(t[(s-=r)>>>3]&1<<(7&s)))return!0;this.cursor--}return!1},this.eq_s=function(t){return!(this.limit-this.cursor>>1),o=0,a=e=(l=t[r])[0].length){if(this.cursor=s+l[0].length,l.length<4)return l[2];var g=l[3](this);if(this.cursor=s+l[0].length,g)return l[2]}}while(0<=(r=l[1]));return 0},this.find_among_b=function(t){for(var r=0,i=t.length,s=this.cursor,h=this.limit_backward,e=0,n=0,c=!1;;){for(var u,o=r+(i-r>>1),a=0,l=e=(u=t[r])[0].length){if(this.cursor=s-u[0].length,u.length<4)return u[2];var g=u[3](this);if(this.cursor=s-u[0].length,g)return u[2]}}while(0<=(r=u[1]));return 0},this.replace_s=function(t,r,i){var s=i.length-(r-t);return this.current=this.current.slice(0,t)+i+this.current.slice(r),this.limit+=s,this.cursor>=r?this.cursor+=s:this.cursor>t&&(this.cursor=t),s},this.slice_check=function(){return!(this.bra<0||this.bra>this.ket||this.ket>this.limit||this.limit>this.current.length)},this.slice_from=function(t){var r=!1;return this.slice_check()&&(this.replace_s(this.bra,this.ket,t),r=!0),r},this.slice_del=function(){return this.slice_from("")},this.insert=function(t,r,i){r=this.replace_s(t,r,i);t<=this.bra&&(this.bra+=r),t<=this.ket&&(this.ket+=r)},this.slice_to=function(){var t="";return t=this.slice_check()?this.current.slice(this.bra,this.ket):t},this.assign_to=function(){return this.current.slice(0,this.limit)}};
+var EnglishStemmer=function(){var a=new BaseStemmer,c=[["arsen",-1,-1],["commun",-1,-1],["emerg",-1,-1],["gener",-1,-1],["later",-1,-1],["organ",-1,-1],["past",-1,-1],["univers",-1,-1]],o=[["'",-1,1],["'s'",0,1],["'s",-1,1]],u=[["ied",-1,2],["s",-1,3],["ies",1,2],["sses",1,1],["ss",1,-1],["us",1,-1]],t=[["succ",-1,1],["proc",-1,1],["exc",-1,1]],l=[["even",-1,2],["cann",-1,2],["inn",-1,2],["earr",-1,2],["herr",-1,2],["out",-1,2],["y",-1,1]],n=[["",-1,-1],["ed",0,2],["eed",1,1],["ing",0,3],["edly",0,2],["eedly",4,1],["ingly",0,2]],f=[["",-1,3],["bb",0,2],["dd",0,2],["ff",0,2],["gg",0,2],["bl",0,1],["mm",0,2],["nn",0,2],["pp",0,2],["rr",0,2],["at",0,1],["tt",0,2],["iz",0,1]],_=[["anci",-1,3],["enci",-1,2],["ogi",-1,14],["li",-1,16],["bli",3,12],["abli",4,4],["alli",3,8],["fulli",3,9],["lessli",3,15],["ousli",3,10],["entli",3,5],["aliti",-1,8],["biliti",-1,12],["iviti",-1,11],["tional",-1,1],["ational",14,7],["alism",-1,8],["ation",-1,7],["ization",17,6],["izer",-1,6],["ator",-1,7],["iveness",-1,11],["fulness",-1,9],["ousness",-1,10],["ogist",-1,13]],m=[["icate",-1,4],["ative",-1,6],["alize",-1,3],["iciti",-1,4],["ical",-1,4],["tional",-1,1],["ational",5,2],["ful",-1,5],["ness",-1,5]],b=[["ic",-1,1],["ance",-1,1],["ence",-1,1],["able",-1,1],["ible",-1,1],["ate",-1,1],["ive",-1,1],["ize",-1,1],["iti",-1,1],["al",-1,1],["ism",-1,1],["ion",-1,2],["er",-1,1],["ous",-1,1],["ant",-1,1],["ent",-1,1],["ment",15,1],["ement",16,1]],k=[["e",-1,1],["l",-1,2]],g=[["andes",-1,-1],["atlas",-1,-1],["bias",-1,-1],["cosmos",-1,-1],["early",-1,5],["gently",-1,3],["howe",-1,-1],["idly",-1,2],["news",-1,-1],["only",-1,6],["singly",-1,7],["skies",-1,1],["sky",-1,-1],["ugly",-1,4]],d=[17,64],v=[17,65,16,1],i=[1,17,65,208,1],w=[55,141,2],p=!1,y=0,h=0;function q(){var r=a.limit-a.cursor;return!!(a.out_grouping_b(i,89,121)&&a.in_grouping_b(v,97,121)&&a.out_grouping_b(v,97,121)||(a.cursor=a.limit-r,a.out_grouping_b(v,97,121)&&a.in_grouping_b(v,97,121)&&!(a.cursor>a.limit_backward))||(a.cursor=a.limit-r,a.eq_s_b("past")))}function z(){return h<=a.cursor}function Y(){return y<=a.cursor}this.stem=function(){var r=a.cursor;if(!(()=>{var r;if(a.bra=a.cursor,0!=(r=a.find_among(g))&&(a.ket=a.cursor,!(a.cursora.limit)a.cursor=i;else{a.cursor=e,a.cursor=r,(()=>{p=!1;var r=a.cursor;if(a.bra=a.cursor,!a.eq_s("'")||(a.ket=a.cursor,a.slice_del())){a.cursor=r;r=a.cursor;if(a.bra=a.cursor,a.eq_s("y")){if(a.ket=a.cursor,!a.slice_from("Y"))return;p=!0}a.cursor=r;for(r=a.cursor;;){var i=a.cursor;r:{for(;;){var e=a.cursor;if(a.in_grouping(v,97,121)&&(a.bra=a.cursor,a.eq_s("y"))){a.ket=a.cursor,a.cursor=e;break}if(a.cursor=e,a.cursor>=a.limit)break r;a.cursor++}if(!a.slice_from("Y"))return;p=!0;continue}a.cursor=i;break}a.cursor=r}})(),h=a.limit,y=a.limit;i=a.cursor;r:{var s=a.cursor;if(0==a.find_among(c)){if(a.cursor=s,!a.go_out_grouping(v,97,121))break r;if(a.cursor++,!a.go_in_grouping(v,97,121))break r;a.cursor++}h=a.cursor,a.go_out_grouping(v,97,121)&&(a.cursor++,a.go_in_grouping(v,97,121))&&(a.cursor++,y=a.cursor)}a.cursor=i,a.limit_backward=a.cursor,a.cursor=a.limit;var e=a.limit-a.cursor,r=((()=>{var r=a.limit-a.cursor;if(a.ket=a.cursor,0==a.find_among_b(o))a.cursor=a.limit-r;else if(a.bra=a.cursor,!a.slice_del())return;if(a.ket=a.cursor,0!=(r=a.find_among_b(u)))switch(a.bra=a.cursor,r){case 1:if(a.slice_from("ss"))break;return;case 2:r:{var i=a.limit-a.cursor,e=a.cursor-2;if(!(e{a.ket=a.cursor,o=a.find_among_b(n),a.bra=a.cursor;r:{var r=a.limit-a.cursor;i:{switch(o){case 1:var i=a.limit-a.cursor;e:{var e=a.limit-a.cursor;if(0==a.find_among_b(t)||a.cursor>a.limit_backward){if(a.cursor=a.limit-e,!z())break e;if(!a.slice_from("ee"))return}}a.cursor=a.limit-i;break;case 2:break i;case 3:if(0==(o=a.find_among_b(l)))break i;switch(o){case 1:var s=a.limit-a.cursor;if(!a.out_grouping_b(v,97,121))break i;if(a.cursor>a.limit_backward)break i;if(a.cursor=a.limit-s,a.bra=a.cursor,a.slice_from("ie"))break;return;case 2:if(a.cursor>a.limit_backward)break i}}break r}a.cursor=a.limit-r;var c=a.limit-a.cursor;if(!a.go_out_grouping_b(v,97,121))return;if(a.cursor--,a.cursor=a.limit-c,!a.slice_del())return;a.ket=a.cursor,a.bra=a.cursor;var o,c=a.limit-a.cursor;switch(o=a.find_among_b(f)){case 1:return a.slice_from("e");case 2:var u=a.limit-a.cursor;if(a.in_grouping_b(d,97,111)&&!(a.cursor>a.limit_backward))return;a.cursor=a.limit-u;break;case 3:return a.cursor!=h||(u=a.limit-a.cursor,q()&&(a.cursor=a.limit-u,a.slice_from("e")))}if(a.cursor=a.limit-c,a.ket=a.cursor,a.cursor<=a.limit_backward)return;if(a.cursor--,a.bra=a.cursor,!a.slice_del())return}})(),a.cursor=a.limit-r,a.limit-a.cursor),r=(a.ket=a.cursor,e=a.limit-a.cursor,(a.eq_s_b("y")||(a.cursor=a.limit-e,a.eq_s_b("Y")))&&(a.bra=a.cursor,a.out_grouping_b(v,97,121))&&a.cursor>a.limit_backward&&a.slice_from("i"),a.cursor=a.limit-i,a.limit-a.cursor),e=((()=>{var r;if(a.ket=a.cursor,0!=(r=a.find_among_b(_))&&(a.bra=a.cursor,z()))switch(r){case 1:if(a.slice_from("tion"))break;return;case 2:if(a.slice_from("ence"))break;return;case 3:if(a.slice_from("ance"))break;return;case 4:if(a.slice_from("able"))break;return;case 5:if(a.slice_from("ent"))break;return;case 6:if(a.slice_from("ize"))break;return;case 7:if(a.slice_from("ate"))break;return;case 8:if(a.slice_from("al"))break;return;case 9:if(a.slice_from("ful"))break;return;case 10:if(a.slice_from("ous"))break;return;case 11:if(a.slice_from("ive"))break;return;case 12:if(a.slice_from("ble"))break;return;case 13:if(a.slice_from("og"))break;return;case 14:if(!a.eq_s_b("l"))return;if(a.slice_from("og"))break;return;case 15:if(a.slice_from("less"))break;return;case 16:if(!a.in_grouping_b(w,99,116))return;if(a.slice_del())break}})(),a.cursor=a.limit-r,a.limit-a.cursor),i=((()=>{var r;if(a.ket=a.cursor,0!=(r=a.find_among_b(m))&&(a.bra=a.cursor,z()))switch(r){case 1:if(a.slice_from("tion"))break;return;case 2:if(a.slice_from("ate"))break;return;case 3:if(a.slice_from("al"))break;return;case 4:if(a.slice_from("ic"))break;return;case 5:if(a.slice_del())break;return;case 6:if(!Y())return;if(a.slice_del())break}})(),a.cursor=a.limit-e,a.limit-a.cursor),r=((()=>{var r;if(a.ket=a.cursor,0!=(r=a.find_among_b(b))&&(a.bra=a.cursor,Y()))switch(r){case 1:if(a.slice_del())break;return;case 2:var i=a.limit-a.cursor;if(!a.eq_s_b("s")&&(a.cursor=a.limit-i,!a.eq_s_b("t")))return;if(a.slice_del())break}})(),a.cursor=a.limit-i,a.limit-a.cursor),e=((()=>{var r;if(a.ket=a.cursor,0!=(r=a.find_among_b(k)))switch(a.bra=a.cursor,r){case 1:if(!Y()){if(!z())return;var i=a.limit-a.cursor;if(q())return;a.cursor=a.limit-i}if(a.slice_del())break;return;case 2:if(!Y())return;if(!a.eq_s_b("l"))return;if(a.slice_del())break}})(),a.cursor=a.limit-r,a.cursor=a.limit_backward,a.cursor);(()=>{if(p)for(;;){var r=a.cursor;r:{for(;;){var i=a.cursor;if(a.bra=a.cursor,a.eq_s("Y")){a.ket=a.cursor,a.cursor=i;break}if(a.cursor=i,a.cursor>=a.limit)break r;a.cursor++}if(a.slice_from("y"))continue;return}a.cursor=r;break}})(),a.cursor=e}}return!0},this.stemWord=function(r){return a.setCurrent(r),this.stem(),a.getCurrent()}};
+window.Stemmer = EnglishStemmer;
diff --git a/docs/build/html/_static/pygments.css b/docs/build/html/_static/pygments.css
index 691aeb8..5f2b0a2 100644
--- a/docs/build/html/_static/pygments.css
+++ b/docs/build/html/_static/pygments.css
@@ -6,25 +6,26 @@ span.linenos.special { color: #000000; background-color: #ffffc0; padding-left:
 .highlight .hll { background-color: #ffffcc }
 .highlight { background: #eeffcc; }
 .highlight .c { color: #408090; font-style: italic } /* Comment */
-.highlight .err { border: 1px solid #FF0000 } /* Error */
+.highlight .err { border: 1px solid #F00 } /* Error */
 .highlight .k { color: #007020; font-weight: bold } /* Keyword */
-.highlight .o { color: #666666 } /* Operator */
+.highlight .o { color: #666 } /* Operator */
 .highlight .ch { color: #408090; font-style: italic } /* Comment.Hashbang */
 .highlight .cm { color: #408090; font-style: italic } /* Comment.Multiline */
 .highlight .cp { color: #007020 } /* Comment.Preproc */
 .highlight .cpf { color: #408090; font-style: italic } /* Comment.PreprocFile */
 .highlight .c1 { color: #408090; font-style: italic } /* Comment.Single */
-.highlight .cs { color: #408090; background-color: #fff0f0 } /* Comment.Special */
+.highlight .cs { color: #408090; background-color: #FFF0F0 } /* Comment.Special */
 .highlight .gd { color: #A00000 } /* Generic.Deleted */
 .highlight .ge { font-style: italic } /* Generic.Emph */
-.highlight .gr { color: #FF0000 } /* Generic.Error */
+.highlight .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */
+.highlight .gr { color: #F00 } /* Generic.Error */
 .highlight .gh { color: #000080; font-weight: bold } /* Generic.Heading */
 .highlight .gi { color: #00A000 } /* Generic.Inserted */
-.highlight .go { color: #333333 } /* Generic.Output */
-.highlight .gp { color: #c65d09; font-weight: bold } /* Generic.Prompt */
+.highlight .go { color: #333 } /* Generic.Output */
+.highlight .gp { color: #C65D09; font-weight: bold } /* Generic.Prompt */
 .highlight .gs { font-weight: bold } /* Generic.Strong */
 .highlight .gu { color: #800080; font-weight: bold } /* Generic.Subheading */
-.highlight .gt { color: #0044DD } /* Generic.Traceback */
+.highlight .gt { color: #04D } /* Generic.Traceback */
 .highlight .kc { color: #007020; font-weight: bold } /* Keyword.Constant */
 .highlight .kd { color: #007020; font-weight: bold } /* Keyword.Declaration */
 .highlight .kn { color: #007020; font-weight: bold } /* Keyword.Namespace */
@@ -32,43 +33,43 @@ span.linenos.special { color: #000000; background-color: #ffffc0; padding-left:
 .highlight .kr { color: #007020; font-weight: bold } /* Keyword.Reserved */
 .highlight .kt { color: #902000 } /* Keyword.Type */
 .highlight .m { color: #208050 } /* Literal.Number */
-.highlight .s { color: #4070a0 } /* Literal.String */
-.highlight .na { color: #4070a0 } /* Name.Attribute */
+.highlight .s { color: #4070A0 } /* Literal.String */
+.highlight .na { color: #4070A0 } /* Name.Attribute */
 .highlight .nb { color: #007020 } /* Name.Builtin */
-.highlight .nc { color: #0e84b5; font-weight: bold } /* Name.Class */
-.highlight .no { color: #60add5 } /* Name.Constant */
-.highlight .nd { color: #555555; font-weight: bold } /* Name.Decorator */
-.highlight .ni { color: #d55537; font-weight: bold } /* Name.Entity */
+.highlight .nc { color: #0E84B5; font-weight: bold } /* Name.Class */
+.highlight .no { color: #60ADD5 } /* Name.Constant */
+.highlight .nd { color: #555; font-weight: bold } /* Name.Decorator */
+.highlight .ni { color: #D55537; font-weight: bold } /* Name.Entity */
 .highlight .ne { color: #007020 } /* Name.Exception */
-.highlight .nf { color: #06287e } /* Name.Function */
+.highlight .nf { color: #06287E } /* Name.Function */
 .highlight .nl { color: #002070; font-weight: bold } /* Name.Label */
-.highlight .nn { color: #0e84b5; font-weight: bold } /* Name.Namespace */
+.highlight .nn { color: #0E84B5; font-weight: bold } /* Name.Namespace */
 .highlight .nt { color: #062873; font-weight: bold } /* Name.Tag */
-.highlight .nv { color: #bb60d5 } /* Name.Variable */
+.highlight .nv { color: #BB60D5 } /* Name.Variable */
 .highlight .ow { color: #007020; font-weight: bold } /* Operator.Word */
-.highlight .w { color: #bbbbbb } /* Text.Whitespace */
+.highlight .w { color: #BBB } /* Text.Whitespace */
 .highlight .mb { color: #208050 } /* Literal.Number.Bin */
 .highlight .mf { color: #208050 } /* Literal.Number.Float */
 .highlight .mh { color: #208050 } /* Literal.Number.Hex */
 .highlight .mi { color: #208050 } /* Literal.Number.Integer */
 .highlight .mo { color: #208050 } /* Literal.Number.Oct */
-.highlight .sa { color: #4070a0 } /* Literal.String.Affix */
-.highlight .sb { color: #4070a0 } /* Literal.String.Backtick */
-.highlight .sc { color: #4070a0 } /* Literal.String.Char */
-.highlight .dl { color: #4070a0 } /* Literal.String.Delimiter */
-.highlight .sd { color: #4070a0; font-style: italic } /* Literal.String.Doc */
-.highlight .s2 { color: #4070a0 } /* Literal.String.Double */
-.highlight .se { color: #4070a0; font-weight: bold } /* Literal.String.Escape */
-.highlight .sh { color: #4070a0 } /* Literal.String.Heredoc */
-.highlight .si { color: #70a0d0; font-style: italic } /* Literal.String.Interpol */
-.highlight .sx { color: #c65d09 } /* Literal.String.Other */
+.highlight .sa { color: #4070A0 } /* Literal.String.Affix */
+.highlight .sb { color: #4070A0 } /* Literal.String.Backtick */
+.highlight .sc { color: #4070A0 } /* Literal.String.Char */
+.highlight .dl { color: #4070A0 } /* Literal.String.Delimiter */
+.highlight .sd { color: #4070A0; font-style: italic } /* Literal.String.Doc */
+.highlight .s2 { color: #4070A0 } /* Literal.String.Double */
+.highlight .se { color: #4070A0; font-weight: bold } /* Literal.String.Escape */
+.highlight .sh { color: #4070A0 } /* Literal.String.Heredoc */
+.highlight .si { color: #70A0D0; font-style: italic } /* Literal.String.Interpol */
+.highlight .sx { color: #C65D09 } /* Literal.String.Other */
 .highlight .sr { color: #235388 } /* Literal.String.Regex */
-.highlight .s1 { color: #4070a0 } /* Literal.String.Single */
+.highlight .s1 { color: #4070A0 } /* Literal.String.Single */
 .highlight .ss { color: #517918 } /* Literal.String.Symbol */
 .highlight .bp { color: #007020 } /* Name.Builtin.Pseudo */
-.highlight .fm { color: #06287e } /* Name.Function.Magic */
-.highlight .vc { color: #bb60d5 } /* Name.Variable.Class */
-.highlight .vg { color: #bb60d5 } /* Name.Variable.Global */
-.highlight .vi { color: #bb60d5 } /* Name.Variable.Instance */
-.highlight .vm { color: #bb60d5 } /* Name.Variable.Magic */
+.highlight .fm { color: #06287E } /* Name.Function.Magic */
+.highlight .vc { color: #BB60D5 } /* Name.Variable.Class */
+.highlight .vg { color: #BB60D5 } /* Name.Variable.Global */
+.highlight .vi { color: #BB60D5 } /* Name.Variable.Instance */
+.highlight .vm { color: #BB60D5 } /* Name.Variable.Magic */
 .highlight .il { color: #208050 } /* Literal.Number.Integer.Long */
\ No newline at end of file
diff --git a/docs/build/html/_static/searchtools.js b/docs/build/html/_static/searchtools.js
index e09f926..e29b1c7 100644
--- a/docs/build/html/_static/searchtools.js
+++ b/docs/build/html/_static/searchtools.js
@@ -1,25 +1,20 @@
 /*
- * searchtools.js
- * ~~~~~~~~~~~~~~~~
- *
  * Sphinx JavaScript utilities for the full-text search.
- *
- * :copyright: Copyright 2007-2021 by the Sphinx team, see AUTHORS.
- * :license: BSD, see LICENSE for details.
- *
  */
+"use strict";
 
-if (!Scorer) {
-  /**
-   * Simple result scoring code.
-   */
+/**
+ * Simple result scoring code.
+ */
+if (typeof Scorer === "undefined") {
   var Scorer = {
     // Implement the following function to further tweak the score for each result
-    // The function takes a result array [filename, title, anchor, descr, score]
+    // The function takes a result array [docname, title, anchor, descr, score, filename]
     // and returns the new score.
     /*
-    score: function(result) {
-      return result[4];
+    score: result => {
+      const [docname, title, anchor, descr, score, filename, kind] = result
+      return score
     },
     */
 
@@ -28,9 +23,11 @@ if (!Scorer) {
     // or matches in the last dotted part of the object name
     objPartialMatch: 6,
     // Additive scores depending on the priority of the object
-    objPrio: {0:  15,   // used to be importantResults
-              1:  5,   // used to be objectResults
-              2: -5},  // used to be unimportantResults
+    objPrio: {
+      0: 15, // used to be importantResults
+      1: 5, // used to be objectResults
+      2: -5, // used to be unimportantResults
+    },
     //  Used when the priority is not in the mapping.
     objPrioDefault: 0,
 
@@ -39,452 +36,628 @@ if (!Scorer) {
     partialTitle: 7,
     // query found in terms
     term: 5,
-    partialTerm: 2
+    partialTerm: 2,
   };
 }
 
-if (!splitQuery) {
-  function splitQuery(query) {
-    return query.split(/\s+/);
+// Global search result kind enum, used by themes to style search results.
+// prettier-ignore
+class SearchResultKind {
+  static get index() { return "index"; }
+  static get object() { return "object"; }
+  static get text() { return "text"; }
+  static get title() { return "title"; }
+}
+
+const _removeChildren = (element) => {
+  while (element && element.lastChild) element.removeChild(element.lastChild);
+};
+
+/**
+ * See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions#escaping
+ */
+const _escapeRegExp = (string) =>
+  string.replace(/[.*+\-?^${}()|[\]\\]/g, "\\$&"); // $& means the whole matched string
+
+const _escapeHTML = (text) => {
+  return text
+    .replaceAll("&", "&")
+    .replaceAll("<", "<")
+    .replaceAll(">", ">")
+    .replaceAll('"', """)
+    .replaceAll("'", "'");
+};
+
+const _displayItem = (item, searchTerms, highlightTerms) => {
+  const docBuilder = DOCUMENTATION_OPTIONS.BUILDER;
+  const docFileSuffix = DOCUMENTATION_OPTIONS.FILE_SUFFIX;
+  const docLinkSuffix = DOCUMENTATION_OPTIONS.LINK_SUFFIX;
+  const showSearchSummary = DOCUMENTATION_OPTIONS.SHOW_SEARCH_SUMMARY;
+  const contentRoot = document.documentElement.dataset.content_root;
+
+  const [docName, title, anchor, descr, score, _filename, kind] = item;
+
+  let listItem = document.createElement("li");
+  // Add a class representing the item's type:
+  // can be used by a theme's CSS selector for styling
+  // See SearchResultKind for the class names.
+  listItem.classList.add(`kind-${kind}`);
+  let requestUrl;
+  let linkUrl;
+  if (docBuilder === "dirhtml") {
+    // dirhtml builder
+    let dirname = docName + "/";
+    if (dirname.match(/\/index\/$/))
+      dirname = dirname.substring(0, dirname.length - 6);
+    else if (dirname === "index/") dirname = "";
+    requestUrl = contentRoot + dirname;
+    linkUrl = requestUrl;
+  } else {
+    // normal html builders
+    requestUrl = contentRoot + docName + docFileSuffix;
+    linkUrl = docName + docLinkSuffix;
+  }
+  let linkEl = listItem.appendChild(document.createElement("a"));
+  linkEl.href = linkUrl + anchor;
+  linkEl.dataset.score = score;
+  linkEl.innerHTML = _escapeHTML(title);
+  if (descr) {
+    listItem.appendChild(document.createElement("span")).innerHTML =
+      ` (${_escapeHTML(descr)})`;
+    // highlight search terms in the description
+    if (SPHINX_HIGHLIGHT_ENABLED)
+      // SPHINX_HIGHLIGHT_ENABLED is set in sphinx_highlight.js
+      highlightTerms.forEach((term) =>
+        _highlightText(listItem, term, "highlighted"),
+      );
+  } else if (showSearchSummary)
+    fetch(requestUrl)
+      .then((responseData) => responseData.text())
+      .then((data) => {
+        if (data)
+          listItem.appendChild(
+            Search.makeSearchSummary(data, searchTerms, anchor),
+          );
+        // highlight search terms in the summary
+        if (SPHINX_HIGHLIGHT_ENABLED)
+          // SPHINX_HIGHLIGHT_ENABLED is set in sphinx_highlight.js
+          highlightTerms.forEach((term) =>
+            _highlightText(listItem, term, "highlighted"),
+          );
+      });
+  Search.output.appendChild(listItem);
+};
+const _finishSearch = (resultCount) => {
+  Search.stopPulse();
+  Search.title.innerText = _("Search Results");
+  if (!resultCount)
+    Search.status.innerText = Documentation.gettext(
+      "Your search did not match any documents. Please make sure that all words are spelled correctly and that you've selected enough categories.",
+    );
+  else
+    Search.status.innerText = Documentation.ngettext(
+      "Search finished, found one page matching the search query.",
+      "Search finished, found ${resultCount} pages matching the search query.",
+      resultCount,
+    ).replace("${resultCount}", resultCount);
+};
+const _displayNextItem = (
+  results,
+  resultCount,
+  searchTerms,
+  highlightTerms,
+) => {
+  // results left, load the summary and display it
+  // this is intended to be dynamic (don't sub resultsCount)
+  if (results.length) {
+    _displayItem(results.pop(), searchTerms, highlightTerms);
+    setTimeout(
+      () => _displayNextItem(results, resultCount, searchTerms, highlightTerms),
+      5,
+    );
+  }
+  // search finished, update title and status message
+  else _finishSearch(resultCount);
+};
+// Helper function used by query() to order search results.
+// Each input is an array of [docname, title, anchor, descr, score, filename, kind].
+// Order the results by score (in opposite order of appearance, since the
+// `_displayNextItem` function uses pop() to retrieve items) and then alphabetically.
+const _orderResultsByScoreThenName = (a, b) => {
+  const leftScore = a[4];
+  const rightScore = b[4];
+  if (leftScore === rightScore) {
+    // same score: sort alphabetically
+    const leftTitle = a[1].toLowerCase();
+    const rightTitle = b[1].toLowerCase();
+    if (leftTitle === rightTitle) return 0;
+    return leftTitle > rightTitle ? -1 : 1; // inverted is intentional
   }
+  return leftScore > rightScore ? 1 : -1;
+};
+
+/**
+ * Default splitQuery function. Can be overridden in ``sphinx.search`` with a
+ * custom function per language.
+ *
+ * The regular expression works by splitting the string on consecutive characters
+ * that are not Unicode letters, numbers, underscores, or emoji characters.
+ * This is the same as ``\W+`` in Python, preserving the surrogate pair area.
+ */
+if (typeof splitQuery === "undefined") {
+  var splitQuery = (query) =>
+    query
+      .split(/[^\p{Letter}\p{Number}_\p{Emoji_Presentation}]+/gu)
+      .filter((term) => term); // remove remaining empty strings
 }
 
 /**
  * Search Module
  */
-var Search = {
-
-  _index : null,
-  _queued_query : null,
-  _pulse_status : -1,
-
-  htmlToText : function(htmlString) {
-      var virtualDocument = document.implementation.createHTMLDocument('virtual');
-      var htmlElement = $(htmlString, virtualDocument);
-      htmlElement.find('.headerlink').remove();
-      docContent = htmlElement.find('[role=main]')[0];
-      if(docContent === undefined) {
-          console.warn("Content block not found. Sphinx search tries to obtain it " +
-                       "via '[role=main]'. Could you check your theme or template.");
-          return "";
-      }
-      return docContent.textContent || docContent.innerText;
-  },
+const Search = {
+  _index: null,
+  _queued_query: null,
+  _pulse_status: -1,
+
+  htmlToText: (htmlString, anchor) => {
+    const htmlElement = new DOMParser().parseFromString(
+      htmlString,
+      "text/html",
+    );
+    for (const removalQuery of [".headerlink", "script", "style"]) {
+      htmlElement.querySelectorAll(removalQuery).forEach((el) => {
+        el.remove();
+      });
+    }
+    if (anchor) {
+      const anchorContent = htmlElement.querySelector(
+        `[role="main"] ${anchor}`,
+      );
+      if (anchorContent) return anchorContent.textContent;
+
+      console.warn(
+        `Anchored content block not found. Sphinx search tries to obtain it via DOM query '[role=main] ${anchor}'. Check your theme or template.`,
+      );
+    }
 
-  init : function() {
-      var params = $.getQueryParameters();
-      if (params.q) {
-          var query = params.q[0];
-          $('input[name="q"]')[0].value = query;
-          this.performSearch(query);
-      }
+    // if anchor not specified or not found, fall back to main content
+    const docContent = htmlElement.querySelector('[role="main"]');
+    if (docContent) return docContent.textContent;
+
+    console.warn(
+      "Content block not found. Sphinx search tries to obtain it via DOM query '[role=main]'. Check your theme or template.",
+    );
+    return "";
   },
 
-  loadIndex : function(url) {
-    $.ajax({type: "GET", url: url, data: null,
-            dataType: "script", cache: true,
-            complete: function(jqxhr, textstatus) {
-              if (textstatus != "success") {
-                document.getElementById("searchindexloader").src = url;
-              }
-            }});
+  init: () => {
+    const query = new URLSearchParams(window.location.search).get("q");
+    document
+      .querySelectorAll('input[name="q"]')
+      .forEach((el) => (el.value = query));
+    if (query) Search.performSearch(query);
   },
 
-  setIndex : function(index) {
-    var q;
-    this._index = index;
-    if ((q = this._queued_query) !== null) {
-      this._queued_query = null;
-      Search.query(q);
+  loadIndex: (url) =>
+    (document.body.appendChild(document.createElement("script")).src = url),
+
+  setIndex: (index) => {
+    Search._index = index;
+    if (Search._queued_query !== null) {
+      const query = Search._queued_query;
+      Search._queued_query = null;
+      Search.query(query);
     }
   },
 
-  hasIndex : function() {
-      return this._index !== null;
-  },
+  hasIndex: () => Search._index !== null,
 
-  deferQuery : function(query) {
-      this._queued_query = query;
-  },
+  deferQuery: (query) => (Search._queued_query = query),
 
-  stopPulse : function() {
-      this._pulse_status = 0;
-  },
+  stopPulse: () => (Search._pulse_status = -1),
 
-  startPulse : function() {
-    if (this._pulse_status >= 0)
-        return;
-    function pulse() {
-      var i;
+  startPulse: () => {
+    if (Search._pulse_status >= 0) return;
+
+    const pulse = () => {
       Search._pulse_status = (Search._pulse_status + 1) % 4;
-      var dotString = '';
-      for (i = 0; i < Search._pulse_status; i++)
-        dotString += '.';
-      Search.dots.text(dotString);
-      if (Search._pulse_status > -1)
-        window.setTimeout(pulse, 500);
-    }
+      Search.dots.innerText = ".".repeat(Search._pulse_status);
+      if (Search._pulse_status >= 0) window.setTimeout(pulse, 500);
+    };
     pulse();
   },
 
   /**
    * perform a search for something (or wait until index is loaded)
    */
-  performSearch : function(query) {
+  performSearch: (query) => {
     // create the required interface elements
-    this.out = $('#search-results');
-    this.title = $('
' + _('Searching') + '
').appendTo(this.out);
-    this.dots = $('').appendTo(this.title);
-    this.status = $('
 
').appendTo(this.out);
-    this.output = $('