job_submit/pbs - Fix for incorrect malloc size

This bug in the new plugin would result in memory corruption.
Enable change of name for running jobs
qsub enhancements

Make "qsub -I" work (no arguments)
Some fixes for node/task count logic for interactive jobs
qsub fixes

Get "qsub -I" working (no arguments)
Fixes for some node/task calcuations for interactive jobs
qsub - make sure batch submit with no arguments works
No job update error if partition down
Merge branch 'slurm-2.6'