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GRHD: Add parameter c2p_dynamic_atm

Florian Attenederrequested to merge
fa/c2p-dynamic-mask into main

This adds and modifies the following parameters in the GRHD section:

  • (new) c2p_dyamic_atm: Controls whether a fluid-atmosphere interface is allowed to evolve.
  • (renamed) c2p_freeze_atm_reset -> c2p_enforce_causal_atm; also updated the doc string

With c2p_dyamic_atm=true we now recompute the c2p_atm_reset mask before determining the c2p_freeze_atm mask. Previously, we only ever ran with the false option, which would mean that we artificially imposed the interface as it was given in the initial data.

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