add general usage c3s work to main dev

[jgriesfeller]

Change Summary

add the non C3S specific parts of the C3S changes on pyaerocom to main-dev

Related issue number

fix #1103

Checklist

• Start with a draft-PR
• The PR title is a good summary of the changes
• PR is set to AeroTools and a tentative milestone
• Documentation reflects the changes where applicable
• Tests for the changes exist where applicable
• Tests pass locally
• Tests pass on CI
• At least 1 reviewer is selected
• Make PR ready to review

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.24%. Comparing base (7e673e6) to head (f53275b).
Report is 1 commits behind head on main-dev.

Additional details and impacted files

@@             Coverage Diff              @@
##           main-dev    #1104      +/-   ##
============================================
+ Coverage     79.22%   79.24%   +0.02%     
============================================
  Files           110      110              
  Lines         19087    19092       +5     
============================================
+ Hits          15122    15130       +8     
+ Misses         3965     3962       -3     

Flag	Coverage Δ
unittests	79.24% <100.00%> (+0.02%)	⬆️

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[lewisblake]

👍