and correct --attach and --join descriptions

Add new env var SLURM_TASK_PID.

   TaskProlog, TaskEpilog, TaskPlugin; srun --task-prolog, --task-epilog).

    slurmctld (at least for linear selection algorithm).

slurm.conf parameters.  This allows prolog and epilog files that srun
launches before and after a job step.

not job steps.

    env var (Brian O'Sullivan, pathscale)

  conn_type, and rotate).
slurmctld to set min_nodes for job based upon geometry (if supplied).
  This avoid trying to schedule jobs when insufficient resources are
  available.

  or co-processor), and communications type (mesh or torus).

   to specified user.
 o New srun option --no-shell
 o Changed uid/gid_from_name () to uid/gid_from_string () and allow
   either user/group name or numerical user/group ID.
 o updated srun(1) documentation with new --no-shell option and
   changed semantics for --uid.

   indicate an infinite timelimit.

   not one process per Node.

 o Add support for generating lightweight corefiles from liblwcf
   setting up LD_PRELOAD properly.

   option from environment and documentation of new env var.