Fix auc and clarify CGMS2DayByDay issues

[staskh]

No description provided.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.22%. Comparing base (be37050) to head (96f9c5e).
⚠️ Report is 76 commits behind head on main.

Files with missing lines	Patch %	Lines
iglu_python/utils.py	85.71%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
- Coverage   90.25%   90.22%   -0.04%     
==========================================
  Files          41       41              
  Lines        1581     1585       +4     
==========================================
+ Hits         1427     1430       +3     
- Misses        154      155       +1     

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