Needed for totalview support of reattach.

 o slurmd tries to kill any old slurmd's on startup
 o create_pidfile() locks pid file and keeps it open, so that
   we can test pidfile for lock to definitively know whether old
   slurmd is still running.

   affect number of tasks in batch job steps.

config file values.

avoid over-write with reconfiguration RPC.

free_bitmap

Add support in slurmctld for SlurmctldDebug on startup and reconfig RPC.

and cpus_per_task option.

Slurmctld add node list to job step (leave bitmap too, faster)	Jette
Slurmctld fix node state when job keeps running and node fails	Jette
Slurmctld job requests with min-max resource requirement pair	Jette
Slurmctld job requests with excluded node list (--exclude)	Jette

(it can vary if node range is specified "-N2-8").

This permits node count to rise as needed for processor count.

ease of use in slurmctld

   (stderr could be disconnected but writable would return true)

   response message

TotalView (it was intercepting the SIGTERM and reporting srun's tasks
in addition to the user's tasks - very confusing).

Based upon kernel mod that permits SIGSTOP to child and ptrace(DETACH).

   (to match documentation)
 o Use access(2) to determine if user has local access to file
   (instead of brute force examination of stat buffer)
 o issue warning if local command cannot be found with --batch

Also add exclude=node_list to allocate RPCs.
slurmctld accepts new RPC arguments, but does nothing with them (yet).
Besides processing new arguments, srun: will process node lists from
file rather than in-line list, sets SLURM_NNODES environment variable
based upon actual count of allocated nodes, and constraints info
in debug mode reported in full (was only reporting last constraint
found).

Also add exclude=node_list to allocate RPCs.
slurmctld accepts new RPC arguments, but does nothing with them (yet).

Also add exclude=node_list to allocate RPCs.