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GRHD: Add initial data for Bondi accretion with infalling matter

Florian Atteneder requested to merge fa/grhd-bondi-infall into main

This adds the following parameters to the GRHD section

  • id: new option bondi_accretion_infall
  • id_bondi_accretion_infall_rs: Radius below which the low-density fluid is initially set.
  • id_bondi_accretion_infall_ρl: The density of the low-density fluid.
  • analyze_error_reference_solution: the name of a reference solution that is to be used for the error estimation

This test is taken from Bugner's thesis 2017, and a paper by Radice, Rezolla 2011.

This PR also disables the questionable rescaling of the viscosity that was added for the TOV tests. If needed it can be restored, but should be hidden behind a proper parameter.

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