autotest: run mavproxy.py from $PATH
Plane: use the projected position for geofencing and waypoints
Plane: enable failsafe battery reporting
AP_Notify: grab initial flags state in init()

this prevents annoying tones on startup of APM:Plane
Rover: prevent arming tone on startup
Plane: prevent arming tone on startup
Plane: set failsafe_radio AP_Notify bits
Iris Params: reduce Yaw IMAX and increased Loiter speed
Copter Motors: increase MOT_SPIN_ARMED to int16
Copter: AC3.1-rc2 version and release notes