Add batch API, Python 3.10+, Fortran vectorization, matplotlib fix

[Mxade]

Description

This PR adds a vectorized/batch API, broadens Python support, and fixes matplotlib compatibility:

• hwm14_vectorized() – New function for vectorized/batch evaluation: accepts arrays of altitude, latitude, longitude, and UTC hours and returns zonal/meridional wind arrays in one call. When the Fortran extension is built, a new hwm14_batch subroutine is used for a single Fortran call over N points; otherwise a Python loop over the existing single-point hwm14 is used.
• requires-python >=3.10 – Relaxed from >=3.13 so the package can be used on Python 3.10–3.13 (and 3.14).
• Plotting – Normalize(vmin, vmax) is now used when both limits are set, instead of passing norm=Normalize() together with vmin/vmax to pcolor, for compatibility with current matplotlib.
• FORK_README.md – Documents build requirements (Fortran compiler), install from tree, batch API usage, and PR/fork notes.
• Tests – New TestHWM14Vectorized in test_core.py for the batch API (single point, batch vs HWM14, default ap, broadcast).

Closes

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• My code follows the project style guidelines (black, ruff, mypy)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix/feature works
• New and existing tests pass with my changes
• Test coverage remains > 80%
• I have updated the documentation (docstrings, README, guides)
• I have added an entry to CHANGELOG.md
• I have updated type hints for modified functions

Testing

• Ran full test suite: pytest tests -v (67 passed, including new TestHWM14Vectorized and existing core/plotting).
• Verified batch results match HWM14 class for the same inputs.
• Built and tested with Python 3.14 and gfortran (macOS).

pip install -e .
pytest tests -v

Additional Context

• Build requires a Fortran compiler (e.g. gfortran); see FORK_README.md.
• If this PR is not merged, the fork can be maintained and optionally published under a different PyPI name.

Made with: Cursor

[rilma]

@Mxade, let's start with this. Python version < 3.13 do not provide bug fixes, so let's stick to >= 3.13

[rilma]

Python versions < 3.13 are not longer with big fixes, see here, so let's stick with the support for >= 3.13 as originally implemented in the repo.

[Mxade]

@rilma Done — reverted to requires-python >= 3.13 and updated FORK_README.md per your comment. Batch API / Fortran / plotting / tests unchanged. Thanks again.