interrupts were resetting timeout in I/O functions with timeout.

word-smithing.

   before opening output files. (Thus, seteuid_and_chdir() renamed
   to _drop_privileges()/_reclaim_privileges())
 o io.c : add srun info objects to tasks' srun list as they attach,
   so new sruns get task exit messages.

 o reattach.c : fixed search for matching job id.

   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

contents.

Minor revision to times.gpl to find data files. Don't know why arch.eps is
even in here....

Perform allocate and step create independently.

data structure.

call REQUEST_IMMEDIATE_RESOURCE_ALLOCATION. This immediate flag also
applies to the slurm_allocate_and_run_job_step() function.