GHRD: Add Marquina's numerical flux for FV+slope limiter and doublecartoon
Adds the following new parameters
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GRHD.fv_numerical_flux = "marquina"
: Numerical flux implementation following Font et al 2000, PRD 61 044011; see Font et al 2002, PRD 65 084024 for TOV tests.
We also update the TOV initial data module to include a function with which one should be able to generate all the configurations that we use in the ref tests.
Edited by Florian Atteneder