Now modeling the new model.  Fixed many of the assert statements to be more helpful.
latest version of UAS in NAS model
transitions can now pass "just updated" memory values in comchannels.

Also did other minor cleanup and fixes.
Added a DEBUG_VERBOSE mode which gives transition detail for the actors during the simulation.
XmlModelParser now outputs a warning if a state has no transitions.
Removed the GUI actors and moved their roles into the systems the connect too.

UAV now takes off and lands.
Cleaned up the monitor landing state of uavop
It is now possible for actors to set event channels to null.
UAVOp now sets the New_Mission event channel to null after reading it.