Fixed update() logic if condglobal or field is missing
Use minimum of avg_trigger and CONX_MIN

Was just using CONX_MIN which is sometimes > avg_trigger resulting in
connections/cells turning on and off.
Also, made tests >= since these are minimums
Modified some debug messages to add more info

Also, moved up earlier in block to order with nested debug messages
better.
Fixed typo in debug message
Added debughook to drop into debugger if an error occurs
Fixed logic for static/kinetic cell attributes

Use fraction of time above/below threshold
Change fusion threshold to 0.01

Allows it to decay away below trigger threshold
Change some debug to MORE level