slight refactorings, docs, typos

[mikapfl]

@JGuetschow it was easier for me to add my refactorings as patches instead of doing them inline in github, so I created a PR into your branch with what I would change in your branch before merging. Changes:

• regenerated api docs (happens if you run "make docs" locally")
• added LocalTrendsStrategy to CSG usage docs
• added some docstrings, moved method docstrings from the class's docstring to the method's docstring
• unified calculate_right_boundary_trend and calculate_left_boundary_trend into one function with case distinctions
• refactored get_shifted_time_value. I first did it with python lists, which is a bit simpler, but using the underlying numpy arrays without converting is much faster, so I did that in the end.
• corrected typos wherever I found them.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.93%. Comparing base (2bcbcec) to head (46b3a26).
Report is 10 commits behind head on csg_filling.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@               Coverage Diff               @@
##           csg_filling     #298      +/-   ##
===============================================
- Coverage        96.94%   96.93%   -0.01%     
===============================================
  Files               54       54              
  Lines             5205     5194      -11     
===============================================
- Hits              5046     5035      -11     
  Misses             159      159              

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[JGuetschow]

Thanks for adding docs. I should have said that I intentionally left them for after your review so I don't have to rewrite them in case of changes. Sorry, didn't intend to make you write the docs.

[JGuetschow]

Seems that my pycharm setting for docstrings is not correct, that added the colons, I think

[JGuetschow]

So we use docstrings in the methods and not a methods section. I'll try to remember in the future.

[mikapfl]

Yeah, both works, but generally I like the docs to be as close to the code as possible.

[mikapfl]

@JGuetschow merge yourself if you are happy (will merge into your branch, not into main directly)