Ignore network option on cray step allocation

Advise user to specify network option at job allocation time on
Cray systems rather than within a job step.
bug 741
Expand PBS wrapper info on FAQ
Cray - Make NPC only limit running other NPC jobs on shared blades instead
of limited non NPC jobs.
Fix for sbatch #PBS -m (mail) option parsing

Arguments of "abe" and "aeb" both failed.
bug 743
Fix job dependency bug

Jobs dependent upon multiple other jobs may start prematurely, after
only some of the depdendencies are satisfied.
bug 746
Make depdenency parsing logic more robust
Merge branch 'slurm-14.03'