Merged a bug fix where mode would not revert on geo-fence disable.
The mode would not revert if the switch was in position 0.
Geofencing will soon be in Rover and I didn't want to forget this bug
and chase it later so committing it now. It works fine in Rover now
even though the geofencing code isn't in yet.
the X8R briefly gives PWM of 874 on all channels when the receiver is
setup as "no pulses" failsafe handling. This was interpreted as switch
position 0, which was AUTO for me.
This change rejects pulse widths below 900 for mode changes
Added option (hold roll to full right + SW7 ON/OFF) to init_home during the wp_list reset
Add ROV_SONAR_TRIG (default = 200 cm) - tested by Franco
Restart_nav() added and heading bug correction, tested OK in the field
RTL then stop update - Tested OK in the field
Added SONAR detection for obstacle avoidance
Signed-off-by: Jean-Louis Naudin <jlnaudin@gmail.com>