respect to SlurmdTimeout parameter.

Also call ping_nodes even when SlurmdTimeout=0 so that
non-responsive nodes can be returned to service.

    the node to be returned to use when it starts responding rather than 
    remaining in a non-usable state.

    info reported to Maui.

    of a non-root user to change a job's comment field (used by Maui/Moab for
    storing scheduler state information).

    configuration must be specified in slurm.conf for gang scheduling now.

 (e.g. <=1)

 by scancel

    The current limit is 4GB.

already in srun for this purpose

    in slurm v1.2).

output of uid_to_string() and gid_to_string().