Ordering of processors when creating intracommunicator

[russfiedler]

In mod_oasis_method.F90 when we attempt to make an intracommunicator from an intercommunicator we have the call

CALL mpi_intercomm_merge(tmp_intercomm,.FALSE., new_comm, ierr)

This means that the the ordering of the PEs in unspecified as high=.FALSE. for both components.
I suggest basing the order on a lexical comparison of cdnam (remote component supplied as an argument to the routine) and compnm (the local component, known through mod_oasis_data)

Something like

CALL mpi_intercomm_merge(tmp_intercomm,trim(compnm) > trim(cdnam), new_comm, ierr)

This should put ATM before ICE before OCN and will be unique. Thoughts?