added forecast saving option for config, adjusted forecast tests

[reinecfi]

Related Issue

Closes #797
Closes #800 (other parts fixed by PR #792)

Description

This change adds the possibility to save forecasts and improves forecaster tests.

Checklist

• Documentation updated (docstrings, READMEs, user guides, inline comments, doc folder updates etc.)
• New unit/integration tests added (if applicable)
• Changes noted in release notes (if any)
• Consent to release this PR's code under the GNU Affero General Public License v3.0

[codecov]

Codecov Report

❌ Patch coverage is 73.46939% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.49%. Comparing base (1224215) to head (f6c815a).
⚠️ Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
assume/scenario/loader_csv.py	68.42%	12 Missing ⚠️
assume/common/forecast_algorithms.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #801      +/-   ##
==========================================
- Coverage   80.79%   80.49%   -0.31%     
==========================================
  Files          56       56              
  Lines        8670     9047     +377     
==========================================
+ Hits         7005     7282     +277     
- Misses       1665     1765     +100     

Flag	Coverage Δ
pytest	80.49% <73.46%> (-0.31%)	⬇️

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[mthede]

What do you mean with "are not supported currently"?
Are those demands not included at all or are those demands approximated as inelastic demands? When using it I'd want to know wheter the naive residual load forecast is rather under- or overestimated

[reinecfi]

Adjusted the wording here. The forecast will underestimate the residual load if elastic demand is present.

[mthede]

Same here, see above

[reinecfi]

More or less like above, but since some demand is ignored, the forecast should be smaller (which can lead to a smaller or bigger congestion in absolute terms, depending whether the net load is positive or negative).
Not sure if adding a comment on this will be more confusing than helpful. Especially as this is a naive forecast.

[mthede]

Is an error thrown? How would I figure out what's wrong and how to fix it?

[reinecfi]

I just forgot to remove the TODO here. The if clause circumvents the problem. Currently you are not notified. Maybe one could/should add a warning here?

[mthede]

Hi Finn, thanks for the nice feature of saving the forecasts! That's a great way to check whether the intended values were provided to the units.

I was at first confused by the naming and defaults of the config parameters. Then I realized that we don't really have full documentation of the top-level config options, other than in Notebook 02.

Maybe it's worth documenting the behavior at one place and link to the specific forecaster details in the docs?

Other than those clarifications and documentations, it looks good :)