srun/signals.c
 o added experimental --join option which allows attached srun
   to send signals and stdin to job. (stdin not working yet)
 o other srun and slurmd code cleanup

unexpected job is reported by slurmd and slurmctld sends the job a SIGKILL.

   on POLLHUP but no read method.
 o common/log.c : add pthread_atfork() calls to ensure sanity of log
   data structure after a fork() from a threaded program.
 o slurmd/io.c : set _obj_close as close handler for all objects
 o slurmd/shm.c : fix bug that caused lockfile to always go into /tmp
 o slurmd/mgr.c : reset log prefix to denote job id when logging to a file
 o srun/srun.c : do not call fatal() after having allocated nodes,
   use die() instead which prints an error then does goto cleanup;
 o srun/*.c : remove _debug vestigal var

Add incluode of ptrace header

   calls never block) This is only used in slurmd/mgr.c right now,
   so that log functions called in io.c do not deadlock IO thread.
 o cleanup in srun/srun.c

#ifdef HAVE_TOTALVIEW blocks). Basic functionality seems
to be in place except for holding tasks at startup.

Corrected data structure variable name in launch message reply to srun.

Options exist, but are undocumented features.

time stamp -1 rather than time stamp (in case update happens at
the same second as the last get info RPC).

 o Document fact that three Ctrl-C's will forcefully terminate job.

 o srun -d option updated to set slurmd-debuggging level
 o slurmd sends task launch resp message with list of pids
   (for totalview support)
 o Three Ctrl-C's in rapid succession to srun forcefully terminates the job.
 o Changed --kill-off to --no-kill

are kept in sync with the job records at slurmctld restart.

   Use constant size buffer for stdin.
   slurmd/fname.[ch] : Pre-open and truncate all unique output filenames
   slurmd/io.c       : make call to truncate all output files.