Improvements to TOV evolutions

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

added 1d GRHD experiment labels

enabled an automatic merge when the pipeline for 625c700f succeeds

aborted the automatic merge because source branch was updated

added 1 commit

• 745ee942 - implement different bdry conditions for bondi and tov problem

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added 2 commits

• 10d5cf0c - fixup check for coordinate signularity on grid
• 3cbc9938 - add TODO branches for bdry conds

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added 1 commit

• f6033838 - fix reftest output coloring when non interactive

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enabled an automatic merge when the pipeline for f6033838 succeeds

merged

mentioned in commit 5de00c71

mentioned in merge request !113 (merged)