Add support for job array options in the qsub command, in #PBS
options for sbatch scripts and set the appropriate environment
variables in the spank_pbs plugin (PBS_ARRAY_ID and PBS_ARRAY_INDEX).
Note that Torque uses the "-t" option and PBS Pro uses the "-J"
option.

slurm.conf.  Rebooting daemons after adding nodes to the slurm.conf
is highly recommended.

Add a job flag to indicate when the EpilogSlurmctld us running
and don't purge the job record until it completes. This lets
the EpilogSlurmctld requeue the job and otherwise manage it.
bugs 635 and 636

bug 640

application environment the PMI2 library will connect the the PMI2
server (slurmstepd) instead of using the provided PMI_FD socket.

Cache results for major performance improvement.
bug 636

If a job request explicitly requests a GRES count of zero and that
is not the last GRES in the slurm internal data structures, the job
request will be rejected.
bug 633

Perhaps should also look into doing this for nodeinfo and libstate

this would cause pmd's to hang.

code.

interval.

and SLURM_STEP_ID env vars are set.

merged together.

4TB of memory on them.

sacct.

Add SchedulerParameters options of preempt_reorder_count and
preempt_strict_order.

This is for consistency. All of the other backfill parameters
start with "bf_".

Add support for SchedulerParameters value of bf_max_job_start that limits
the total number of jobs that can be started in a single iteration of the
backfill scheduler.
bug 607

Previously slurmctld would restart without information about
allocated ports. This add save/restore logic which will work
for graceful shutdowns. More work is needed in the case of
slurmctld crashes.