WIP (climatological mean and trend estimation)

[gaelforget]

Here are methodological tests relative to #138

To illustrate ; the default settings in the notebook should produce :

[gaelforget]

To test other cases, run the notebook and change the selectors :

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.15%. Comparing base (af4247a) to head (07ca72b).
⚠️ Report is 11 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #139   +/-   ##
=======================================
  Coverage   80.15%   80.15%           
=======================================
  Files           9        9           
  Lines        1653     1653           
=======================================
  Hits         1325     1325           
  Misses        328      328           

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[gaelforget]

close following merge of #140