Restore analysis_config.output, raise if SHMDIR isn't set

[GianlucaFicarelli]

• Allow to access the cache config and the output path of individual analyses with analysis_config.cache and analysis_config.output, as a shortcut to analysis_config.cache.path.
• Raise an error if the env variable SHMDIR isn't set, instead of logging a warning.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.41%. Comparing base (0c9106b) to head (a8a672c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
+ Coverage   91.39%   91.41%   +0.02%     
==========================================
  Files          45       45              
  Lines        2707     2715       +8     
  Branches      555      556       +1     
==========================================
+ Hits         2474     2482       +8     
  Misses        143      143              
  Partials       90       90              

Flag	Coverage Δ
pytest	91.41% <100.00%> (+0.02%)	⬆️

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