show gzipped structures in analysis report

[mgiulini]

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Closes #713 by adding a check on the clean configuration parameter. If clean is True, then the structures will be gzipped in the last stage of the workflow, thus making them unaccessible in the html report. To solve this, at the postprocessing stage we check the clean parameter. If True, the file names are modified by adding the .gz suffix.

Important : this PR cannot take care of the case in which clean is False at the global level and True at the module level (and vice versa), as this would require a complicated traceback at the postprocessing stage, which is out of the scope of the analysis. This is a very unlikely scenario.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b00edff) 72.46% compared to head (035c063) 72.54%.

Files	Patch %	Lines
src/haddock/libs/libplots.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #758      +/-   ##
==========================================
+ Coverage   72.46%   72.54%   +0.08%     
==========================================
  Files          80       80              
  Lines        7562     7566       +4     
==========================================
+ Hits         5480     5489       +9     
+ Misses       2082     2077       -5     

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