o Initial commit of slurmd changes for batch job and file I/O support,

   along with other general bugfixes and cleanup.

 o cbuf.[ch] list.[ch] : begin using Chris' list and cbuf routines
   from the LSD-Tools project.

 o srun/srun.c : *Always* wait for I/O to complete. This still needs work.

 o srun/launch.c : code cleanup