put all temporary and testing data below the path ~/MyPyaerocom

[jgriesfeller]

The title says it all

Change Summary

just return always a link to ~/MyPyaerocom in the Config class.
Makes all temporary pyaerocom data personal

Related issue number

fix #1229

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 79.30%. Comparing base (e992544) to head (a95b5c2).
Report is 466 commits behind head on main-dev.

Additional details and impacted files

@@             Coverage Diff              @@
##           main-dev    #1230      +/-   ##
============================================
- Coverage     79.31%   79.30%   -0.02%     
============================================
  Files           131      131              
  Lines         20234    20238       +4     
============================================
+ Hits          16048    16049       +1     
- Misses         4186     4189       +3     

Flag	Coverage Δ
unittests	79.30% <100.00%> (-0.02%)	⬇️

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[lewisblake]

We should maybe mention in the release that this change has occurred, so that people are aware if their /home is too full.