Satistical tests reorganization

[AgnesBaud]

Description

• statistical tests in both statistical_test.py and differential_analysis.py
• SeriesBinning: bin into equal-size bins (in addition to equal-width)

Changelogs

• reorganization Chi2 and other statistical tests
• SeriesBinning: to put series into bins

Issue(s)

Fixes #91

Definition of Done

• New code is tested with unit tests
• Documentation has been updated
• Pull Request has been revised by a maintainer of the project

[codecov-commenter]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (5946124) 65.15% compared to head (cdffb0c) 66.25%.
Report is 18 commits behind head on master.

Files	Patch %	Lines
moonstone/analysis/statistical_test.py	95.62%	6 Missing ⚠️
moonstone/utils/pandas/series.py	95.55%	2 Missing ⚠️
moonstone/plot/graphs/bargraph.py	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #92      +/-   ##
==========================================
+ Coverage   65.15%   66.25%   +1.10%     
==========================================
  Files          61       61              
  Lines        2930     3020      +90     
==========================================
+ Hits         1909     2001      +92     
+ Misses       1021     1019       -2     

Flag	Coverage Δ
unittests	66.25% <95.69%> (+1.10%)	⬆️

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