This fixes gnats:162, though I remain unsure of exactly why.

 o Don't print exit status as an error if user generated signal that killed it.
 o Set srun exit status appropriately.
 o Accept more environment variables to initialize options.
 o Other minor fixes.

Minor word-smithing work.

Major update of report.tex per Elizabeth Gebur input.

in get config RPC.

(it was being treated like a shutdown request and shutting down the slurmd
daemons too).

for node-centric output. -n and -p always require a filter argument.

   Do not try to parse #! magic for scripts handed to srun --allocate,
   pass directly to exec() instead. This allows proper handling of
   arguments on the #! line without any chance for errors in SLURM.

if it contains no nodes.

to "job step credential".

Minor word-smithing.

 o Added slurmstatus() function to slurm init.d script -- a modified version
   of status() that tries to detect whether the "main" slurmd is running or
   not.

   to have the correct value for the SlurmUser id