Fix functional tests and generate docs for analysis only

[GianlucaFicarelli]

• Update expected results in functional tests, because the output of statistics.Complexity changed in elephant >= 0.13.0
• Fix warning when building docs, and include blueetl.analysis only

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.49%. Comparing base (051f5c0) to head (1621587).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
+ Coverage   91.42%   91.49%   +0.07%     
==========================================
  Files          45       45              
  Lines        2716     2716              
  Branches      556      556              
==========================================
+ Hits         2483     2485       +2     
  Misses        143      143              
+ Partials       90       88       -2     

Flag	Coverage Δ
pytest	91.49% <ø> (+0.07%)	⬆️

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