artdaq

Ron was running some tests with artdaqDriver, and noticed that there were many complaints about the Event Queue being full and that the art thread was not processing events unless you gave it a long time to get started before starting data flow. I have updated EventStore to print the art thread initialization time (approximate) in startRun, and have it wait up to 4 seconds for the art thread.

A good consequence of this change is that now we no longer have to have any delay between init and start transitions, for automated scripts like run_demo.sh.