this prevents annoying tones on startup of APM:Plane

before the first full packet arrives we could report uninitialised
values for groundspeed and heading

closer to real uBlox delay

point along the runway

this prevents rounding of positions in the rover code

this should cope better with low speed

this allows a slew rate for servos to be specified in degrees/second

GCS failsafe was always enabled

Sounds added for arming, disarming and low battery events

this allows people without specified settings in their receiver for
failsafe to choose FBWA zero throttle glide on throttle failsafe. That
can be a better choice when flying at a R/C club field

useful when using AUTO_FBW_STEER for manual steering in competitions

this is an unusual option that gives FBWA flight control in AUTO
mode. It is being added to support use of APM in an aerial robotics
competition where students need to pilot the plane, but they still
need waypoint triggering of payloads