Mars GCM:
follow-up of the last commit: add the routine check_isotopes_p.F in dyn3dpar. Note: this routine is used in the Earth GCM to check the aberrant
values but for now it is inactive in our version, as long as variable "ok_isotopes" in /dyn3d_common/infotrac.F90 remains "false". This routine was
already present in the sequential version of the dynamics dyn3d.
MV