Improve jtc docs regarding the combination of joints and interfaces

[fmauch]

This basically implements #979 and builds upon #652, since the description has been moved to the parameters file. Making this a draft until #652 is merged.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6623cdd) 47.81% compared to head (cceaa03) 47.61%.
Report is 3 commits behind head on master.

❗ Current head cceaa03 differs from pull request most recent head d536397. Consider uploading reports for the commit d536397 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #980      +/-   ##
==========================================
- Coverage   47.81%   47.61%   -0.21%     
==========================================
  Files          41       41              
  Lines        3871     3871              
  Branches     1827     1827              
==========================================
- Hits         1851     1843       -8     
- Misses        751      760       +9     
+ Partials     1269     1268       -1     

Flag	Coverage Δ
unittests	47.61% <ø> (-0.21%)	⬇️

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see 1 file with indirect coverage changes

[christophfroehlich]

@fmauch you probably could make a PR against the branch in my fork, then we can merge your changes together with the rest?

[fmauch]

Sure thing.

[fmauch]

Closing this in favor of christophfroehlich#4