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Improvements to TOV evolutions

Florian Atteneder requested to merge fa/grhd-tuning into main

The initial goal was to make the TOV example run nicely with an AV methods and DG (when using resolution comparable to literature). Unfortunately, we are not there yet and this will need further investigation in a separate PR.

Nevertheless, we merge the current changes now as it contains various fixes and improvements:

  • Activate Bernsteining for GRHD project
  • Provide a default AV for GRHD initial data
  • Add training_wheels option for DG method: applies a Bernstein limiter to initial data
  • Various adjustments to cons2prim; but this might not be final yet
  • Allow evolution of symmetric/mirrored TOV (atm requires that origin is not on the grid!)
  • More example parfiles: FV, FV mirrored, DG, DG mirrored

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