This fixes a small bug that appears if you try and use the MUSCL solver (HydroSolver 3) with a pressure floor in play, but on a non-cosmological simulation or with an EOSType > 0.
Previously, the calculation for the min_coeff assumed GravitationalConstant = 4*pi (i.e. cosmology)
This was corrected (all files) to call the variable itself, as is done in Grid_SetMinimumSupport.C (that file cannot be called itself, since HydroSweep are not Grid_ files).
One caveat: the variation of cosmology 'a' with time is still not included in the pressure floor value. This would require 'time' to be passed into the routine.
If EOSType > 0, the pressure floor was comparing pressure with a minimum energy values, instead of pressure with minimum pressure.
This was fixed in L108 (all files) by duplicating the Prim1[i] = max(value1,value2) so that it compares pressure values inside the "EOSType > 0" statement and energy values if outside that. The comparison of the pressure values matches ZeusSource, L89.