Initial code for new grid-type boinc. #3540

Gridmanager and condor_submit now recognize new grid-type 'boinc'.
The gridmanager has new classes BoincJob and BoincResource, and
understands new boinc gahp commands. Large chunks of this code remains
to be written.
Additional code for new grid-type boinc. #3540

All gahp command handlers implemented.
Major pieces remaining:
* Coordinating batch submission.
* Lease renewal.
* Failure recovery.