Verify that the counts of inhibited particles match the particles actually moved to the end of the particle arrays.

Move the inhibited particles at the end of the particle array. Make the exchange of strays ignore inhibited elements.

Made all the scalar hydro loops over neighbours ignore the inhibited particles. Added checks in the Minimal-SPH scheme to catch any inhibited particle that would have survived.

Define the viscosity beta as a constant instead of a hardcoded value

See merge request !627