OpenMPI build with slurm compatibility

Prior to this commit, compilation of OpenMPI used the default OpenMPI
choices of deciding which libraries should be used in relating to a job
scheduler [1] (such as Slurm [2]). Given that the user on a multi-user
cluster has to accept the sysadmin's choice of a job scheduler, the
question of whether to (1) link with OpenMPI's own libraries (and increase
the reproducibility of the science project) or rather (2) link with the
sysadmin managed libraries (more likely to be compatible with the host's
job scheduler), is an open question of which the best strategy for
reproducibility needs to be debated and studied.

In this commit, strategy (1) is adopted. The options '--withpmix=internal'
and '--with-hwloc=internal' are added to the configure command. The working
assumption is that the Maneage version of OpenMPI is likely to be modern
enough to be compatible with the native job scheduler such as
Slurm. Compilation without any 'pmix' option gave a fail in at least one
case; it appears that an external pmix library was sought by the configure
script.

As of OpenMPI 4.0.1, the internal libevent library is used by default, so
there appears to be no option to force it to be chosen internally.

This commit also includes the option '--without-verbs'.  This option
removes a library related to "infiniband", "verbs", "openib" and "BTL";
this library appears to be deprecated. See [3], [4] for discussion.

Please add feedback and discussion to the Maneage task about openmpi
linking strategies (1) (internal) and (2) (external) at Savannah [5].

[1] https://en.wikipedia.org/wiki/Job_scheduler#Batch_queuing_for_HPC_clusters
[2] https://en.wikipedia.org/wiki/Slurm_Workload_Manager - To avoid a name
    clash, 'slurm-wlm' is the metapackage in Debian for the client
    commands, the compute node daemon, and the central node daemon. An
    unrelated package 'slurm' also exists.
[3] https://www-lb.open-mpi.org/faq/?category=openfabrics#ofa-device-error
[4] https://www-lb.open-mpi.org/faq/?category=building
[5] https://savannah.nongnu.org/task/index.php?15737

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