Fixes problem running very large number of simultaneous jobs when
their inactivity limit was reached due to a backlog of message.

data structure. This eliminates risks associated with re-reading slurm.conf.

   invalid or expired job.

as needed. This is important when values are reset on SIGHUP.

(gnats:381)

to relinquish control. This is necessary since a temporary network problem
can result in the BackupController becoming the primary server even while
the server on the ControllerMachine continues execution. While this event
is impossible to prevent, the new code restores proper operation when
communications are restored.
(gnats:387)

   expiration. (Also added at least one fix to the code)

state recovery.

proceeding.

syserrno() as needed.

them when partition limits change.

the plugins themselves. Add new functions to each plugin to return the
error number and given an error number, return a description.

Minor changes are needed to the plugin code to make them consistent.

  parameter.

  Attempted "scontrol reconfig" or SIGHUP requests result in error and
  ignoring change to SwitchType. Document how to change a cluster's SwitchType.

  due to multiple background theads that are difficult to clean-up.

daemon restart).

reconfiguration (rather than restart).

the directory with access rights based upon its umask. A umask value of
007 when creating the directory results in batch jobs always failing.

responding. Wait for tasks to complete or administrator to set DOWN.

If any errors occur unpacking a job credential, don't recover that job
step or any subsequent jobs.

Slurmctld must be restarted to re-load any plugin.