fix #145 and improve data behaviour

[lpofredc]

• Fix Extraction par intervalle de temps - Rien ne se passe à l'éxécution #145, script is now executable as expected.
• Improved script behavior when formatting data. Data is now formatted with one column per year or month, depending on the configuration of the aggregation parameter, whereas previously it generated one column per year-month of the chosen period.
• Period selection is now done in the same way as for other scripts

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 50 lines in your changes missing coverage. Please review.

Project coverage is 5.29%. Comparing base (f0699ae) to head (31612a8).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
plugin_qgis_lpo/commons/helpers.py	0.00%	24 Missing ⚠️
plugin_qgis_lpo/processing/processing_algorithm.py	0.00%	24 Missing ⚠️
plugin_qgis_lpo/processing/refresh_data.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #147      +/-   ##
=========================================
+ Coverage    5.21%   5.29%   +0.07%     
=========================================
  Files          22      22              
  Lines        1571    1550      -21     
  Branches      221     214       -7     
=========================================
  Hits           82      82              
+ Misses       1485    1464      -21     
  Partials        4       4              

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