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EulerEq: Allow use of more than one AV indicator

Florian Atteneder requested to merge fa/euler-multp-av-indicators into main

This adds two new options

  • av_indicator_variables: a list of variables to which the AV indicator should be applied to. This generates one viscosity per variable.
  • av_combine_operator: an operater with which multiple viscosities are reduced to a single one.

We also re-activated the euler_sod_shock_tube_entropyav reftest, which now seems to give acceptable results. Also updated the euler2d_kelvin_helmholtz_entropyav reftest, although that should not have been necessary. However, 2d experiments are not declared stable anyways, so will need to check those later again regardless.

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