use a user specific paths.ini if it exists (in ~MyPyaerocom)

[jgriesfeller]

Change Summary

Related issue number

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

Attention: Patch coverage is 89.28571% with 3 lines in your changes missing coverage. Please review.

Project coverage is 78.49%. Comparing base (114ecdd) to head (2663ca2).
Report is 49 commits behind head on main-dev.

Files with missing lines	Patch %	Lines
pyaerocom/config.py	89.28%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           main-dev    #1348      +/-   ##
============================================
- Coverage     78.85%   78.49%   -0.37%     
============================================
  Files           136      136              
  Lines         20849    20846       -3     
============================================
- Hits          16441    16363      -78     
- Misses         4408     4483      +75     

Flag	Coverage Δ
unittests	78.49% <89.28%> (-0.37%)	⬇️

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[jgriesfeller]

Notes to myself:

• The whole paths.ini reading and interpretation is weird and therefore needs a rewrite.
• Why are the obs names of the legacy obs networks not read from the ini file?
• Why are the obs names of the legacy obs networks in paths.ini?
• Why has the BASEPATH variable in all subsections to be set (in paths.ini) and point to a valid location even when it's not used?

[jgriesfeller]

This PR only introduces the possibility to use a user specific paths.ini in the directory ~/MyPyaerocom.
It does not address all the flaws in the current pyaerocom.const module

[thorbjoernl]

Some minor changes, otherwise LGTM 🚀

[lewisblake]

Some clean up. I agree in general we should move over to toml in the long run

[thorbjoernl]

LGTM