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().

Also change message slightly (e.g. "forcing job termination" to
"job abort in progress") and don't print them continuously, only once
per second.