More updates to Taal

[ranocha]

Based on comments of @sloede in #200. Let's iterate another round.

[codecov]

Codecov Report

Merging #218 into dev will decrease coverage by 2.44%.
The diff coverage is 81.96%.

@@            Coverage Diff             @@
##              dev     #218      +/-   ##
==========================================
- Coverage   91.53%   89.09%   -2.45%     
==========================================
  Files          36       58      +22     
  Lines        8037    10434    +2397     
==========================================
+ Hits         7357     9296    +1939     
- Misses        680     1138     +458     

Impacted Files	Coverage Δ
src/Trixi.jl	100.00% <ø> (ø)
src/equations/3d/hyperbolic_diffusion.jl	78.98% <0.00%> (-0.51%)	⬇️
src/solvers/dg/3d/dg.jl	92.10% <0.00%> (ø)
src/solvers/solvers.jl	90.90% <ø> (ø)
src/solvers/dg/indicators.jl	35.84% <35.84%> (ø)
src/auxiliary/containers.jl	90.75% <42.85%> (ø)
src/equations/3d/ideal_glm_mhd.jl	92.49% <50.00%> (-0.21%)	⬇️
src/mesh/tree.jl	94.63% <50.00%> (ø)
src/solvers/dg/3d/containers.jl	91.80% <50.00%> (-0.14%)	⬇️
src/equations/2d/linear_scalar_advection.jl	77.50% <55.55%> (-3.59%)	⬇️
... and 63 more

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