extend calc_error_norms(func, dg, t)

[ranocha]

No description provided.

[sloede]

LGTM & can be merged once the (minor) comments are addressed/discarded.

[codecov]

Codecov Report

Merging #172 into master will decrease coverage by 2.82%.
The diff coverage is 89.16%.

@@            Coverage Diff             @@
##           master     #172      +/-   ##
==========================================
- Coverage   94.46%   91.64%   -2.83%     
==========================================
  Files          31       31              
  Lines        6779     6654     -125     
==========================================
- Hits         6404     6098     -306     
- Misses        375      556     +181     

Impacted Files	Coverage Δ
src/Trixi.jl	100.00% <ø> (ø)
src/solvers/dg/2d/amr.jl	96.12% <0.00%> (-2.12%)	⬇️
src/equations/3d/hyperbolic_diffusion.jl	82.14% <33.33%> (-3.37%)	⬇️
src/equations/2d/hyperbolic_diffusion.jl	83.96% <36.36%> (-5.35%)	⬇️
src/solvers/dg/interpolation.jl	93.25% <81.81%> (-4.97%)	⬇️
src/equations/2d/ideal_glm_mhd.jl	88.83% <88.23%> (-3.05%)	⬇️
src/equations/3d/ideal_glm_mhd.jl	91.48% <88.23%> (-0.15%)	⬇️
src/equations/3d/compressible_euler.jl	89.38% <89.65%> (+0.03%)	⬆️
src/solvers/dg/2d/dg.jl	93.48% <91.21%> (-3.66%)	⬇️
src/solvers/dg/3d/dg.jl	92.14% <94.53%> (-2.53%)	⬇️
... and 36 more

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