Fix batch environment variable setting.

with sbatch.

in the future).

named.  It is really the number of cpus per node.

Have slaunch's return be the maximum task return code.

Fix and revamp test15.9.

Change logging level of a message in slaunch.

needs to print out some tast status messages.

Change slaunch's short --quiet option to -q from -Q.

Add SLURM_STEP_CTX_JOBID which is getable from the step context.