Fixes for PBSPro. Thanks to Piet Jones.

PBSPro is similar to Torque, but not exactly. These fixes get PBSPro up and
running. There were a couple main issues:

1) PBSPro doesn't seem to accept one-array jobs, so J 1-1 won't work. We fixed
that by not asking for an array if there is only one job.
2) For some implementations of PBSPro the -l resources command needs to
all be on one line.