Actors do not depend on ActorRef anymore.
Cleanup.
Fix how events are consumed and produced.
Third stab at DPOR.
DPOR close to being done.  Needs testing and a lot of cleanup.
Bug fixes, cleanup.
Change the way a new trace is created.
Merge with master.
Merge commit 'f46b881c94b3f84a14dbbb8353f555829b523f14'