State transition for queue flush

[MitchBradley]

The state diagram in https://github.com/synthetos/g2/wiki/Status-Reports shows that queue flush causes a transition to End(4) state, but the code in edge transitions instead to Stop(3) state. Based on my reading of the code in master, it also appears that flush transitions to Stop(3), but I have not tested that empirically like I have for edge.

I suspect that this change is deliberate, in order to allow jogging etc in feedholds; if so the diagram should be updated.