Rover now honours the Param1 setting of a time in seconds for a
NAV_WAYPOINT and the Rover will loiter at that waypoint for that
period of time.
Note that as soon as the Rover reaches that waypoint the loiter timer
will start. If you enter a different mode during this time (HOLD for
instance) the timer resets. If you then switch back to AUTO
mode and the Rover returns to that waypoint it will wait for the
loiter time configured in param1.
This is a safety change. Lets say you have a GCS which is in
followme mode which is really GUIDED mode with continually updated
waypoints. If the user then changes mode with the RC transmitter to
HOLD or anything else then the Rover should STOP listening to the
updated guided mode waypoints. This is how Plane/Copter work.