select/cray: disable node state alteration via slurmd

This disables unconditionally setting up DOWN nodes on Cray systems, since this
interferes with the periodic node-state query via Basil/ALPS inventory requests.

Cray: SlurmUser needs to be 'root'

This disallows a SlurmUser other than root. The reason is that slurmctld forks
processes talking to ALPS/BASIL. Doing this requires root permissions.

The following rules apply:
 * the RESERVE method requires that 
   - either the effective UID of the calling process resolves to that of the
     'user_name' attribute of the ReserveParamArray or
   - the effective UID is 0 (super-user), i.e.
   - only root can make reservations for other users;
 * the RELEASE method requires root permissions in all cases (slurmctld uses
   this method on each scheduling cycle to clean up vestigial ALPS reservations).

To avoid entanglements with sudo, this patch simply throws a fatal() message
if the SlurmUser is not root. (An alternative would be to issue an error 
message, but to continue processing.)     

Based upon patch from Gerrit
21_job-info-debuglevel.diff

20_save_one_variable.diff

misc: typos caught while reading source code and documentation
19_typos.diff

    using sview. Also add the ability to delete reservations and partitions.

  slurm.conf man page

BLUEGENE - fixed race condition with preemption where if the wind blows the right way the slurmctld could lock up when preempting jobs to run others.

This is needed by select/bluegene to synchronize block state
for completing jobs.

converted to a midplane count.

with respect to BlueGene systems. Formerly logged bogus inconsistencies.

reording functions. Based upon work by Gerrit plus bug
fixes and documentation that I've added.

Fixed issue where QOS priority wasn't re-normalized until a slurmctld restart when a QOS priority was changed.

Made it so QOS with UsageFactor set to 0 would make it so jobs running under that QOS wouldn't add time to fairshare or association/qos limits.

    job. Formerly would display information about one job, but update next
    selected job.