Error checking in GFS_typedefs.F90 does not abort coupled model

[pjpegion]

Description

The error checking logic in GFS_typedefs.F90 only uses a stop, which only aborts the atmospheric tasks, the ocean and ice model do not get an abort message and just hang.

To Reproduce:

hera / intel Give explicit steps to reproduce the behavior.

1. run a coupled RT
2. then change cplflx=.false.
3. then, model write error message, and atmosphere model processor abort, but model just hangs

Additional context

It looks like GFS_typedefs.F90 should return an error code so atmos.F90 can execute the mpp_errr(FATAL,...) In general, I see other places where stop are used, and should be changed.