Print addition to DOF count

[DanielDoehring]

Closes #1667.

[github-actions]

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Created with ❤️ by the Trixi.jl community.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (00292d1) 87.29% compared to head (6526526) 93.24%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1669      +/-   ##
==========================================
+ Coverage   87.29%   93.24%   +5.95%     
==========================================
  Files         419      419              
  Lines       34140    34112      -28     
==========================================
+ Hits        29802    31806    +2004     
+ Misses       4338     2306    -2032     

Flag	Coverage Δ
unittests	93.24% <100.00%> (+5.95%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/callbacks_step/analysis.jl	92.74% <100.00%> (+2.84%)	⬆️
...c/semidiscretization/semidiscretization_coupled.jl	93.19% <100.00%> (ø)
...emidiscretization/semidiscretization_hyperbolic.jl	91.13% <100.00%> (ø)
...ization/semidiscretization_hyperbolic_parabolic.jl	98.97% <100.00%> (+23.71%)	⬆️

... and 86 files with indirect coverage changes

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[ranocha]

Thanks!