condor_event_timer() in
dagman_main.cpp gets called every five (by default) seconds. In that function, we call
Dag::SubmitReadyJobs() to submit any jobs that are ready; ready any new node job events (see ???); output the status of the DAG; and check whether the DAG is finished.
- Submission/event reading loop -- every 5 sec (default) via daemoncore
- ready queue -- Job objects go into it when ready to submit
- pre scripts are handled kind of kludgily -- might make more sense for Job objects to go into the ready queue when the PRE script should be submitted
- document list of parents, not done parents in Job objects
