TRQ-1833. Optimize the start time for large jobs by doing less string manipulation and moving away from having a subnode for each execution slot on a compute node. Now, each job on a node has one entry that is the job's id and a bitmap for the execution slots used by that job.
Merge branch '4.2-dev' of https://github.com/adaptivecomputing/torque into 4.2-dev
Update .gitignore.