support documented uses of --input,output,error)
 o Allow premature termination of srun (i.e. when IO is not yet
   complete) by insistent user.
 o added xstrfmtcat() and xmemcat() to xstring.c

initiation.
Establish limit of MAX_TASKS_PER_NODE and add matching error code.

exceeds the number of nodes and document this behaviour.

command line option.

before killing job.

Add new srun options: --kill-off (no kill on node failure), --share, and
--time=minutes.