science/abinit: Add MPI options; Fix run-time failures due to wrong version

MPI options NOMPI MPICH OPENMPI are added, MPICH is a default.

As it turned out, openmpi is also currently broken on FreeBSD due
to failure to allocate shmem backing memory.

The abinit failure to determine version is also fixed.
It used UNKNOWN as version which caused run-time failure to save data.

PR: 281122
Reported by: Ramon <rcuscoptc@gmail.com> (run-time failure due to UNKNOWN version)