Update scontrol documentation to reflect who can modify some job parameters.
job_submit/pbs - set PBS_O_WORKDIR to SLURM_SUBMIT_DIR
Remove publication link that can't be published yet
qsub enhancements

Remove -C option (implemented improperly)
Support multiple -W options (array instead of single option)
Map -l proc option to job constraint
Fix parsing of wall time with colons (avoid breaking into multiple tokens)
Credit to NCSC
Fix typo in NEWS
Merge branch 'slurm-2.6'