#DOF for temperature coupling incorrect when some atoms are not part of a COM removal group
grompp would, incorrectly, subtract 3 degrees of freedom for temperature coupling for the group of atoms which is not part of a center of mass motion removal group. This would not happen when there is no center of mass motion removal at all.
So the only affected case is where COM removal is not applied to part of the system.
Fix nrdf with partial COMM removal
In the uncommon case where the center of mass motion is removed for
part of the system but not the whole system, the number of degrees
of freedom for the part without COMM removal would be incorrectly
lowered by 3.