Improve configuration management

[forman]

Checklist (strike out non-applicable):

• Changes documented in CHANGES.md
• Related issue exists and is referred to in the PR description and CHANGES.md
• Added docstrings and API docs for any new/modified user-facing classes and functions
• Changes/features documented in docs/*
• Unit-tests adapted/added for changes/features
• Test coverage remains or increases (target 100%)

[codecov]

Codecov Report

Attention: Patch coverage is 98.21429% with 1 line in your changes missing coverage. Please review.

Project coverage is 98.86%. Comparing base (b1bba07) to head (89825ac).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
xrlint/linter.py	97.36%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
+ Coverage   98.81%   98.86%   +0.04%     
==========================================
  Files          62       62              
  Lines        2542     2559      +17     
  Branches      367      375       +8     
==========================================
+ Hits         2512     2530      +18     
+ Misses         11        9       -2     
- Partials       19       20       +1     

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