Copter: Change Radio Failsafe Timeout

Change Radio Failsafe Timeout from 2 seconds to 200ms
Copter: Change Radio Failsafe Timeout

Change Radio Failsafe Timeout from 2 seconds to 200ms
Copter: Change Radio Failsafe Timeout

Change Radio Failsafe Timeout from 2 seconds to 200ms
Copter: minor formatting update
Copter: update AC3.2-rc3 Release Notes
Copter: add no-break to case to resolve compiler warning

This also helps kick off the auto builder for AC3.2-rc3
Copter: update AC3.2-rc3 ReleaseNotes yet again
AC_AttControl: FF and accel limiting off by default

Also adjust parameter ranges used by GCSs
AP_Motors: add get_throttle_out accessor
Copter: add pre_takeoff throttle feedback

pair-programmed with Randy Mackay
Copter: remain landed until throttle output above 25 percent
Copter: integrate pre-takeoff throttle feedback

This feature slightly revs the motors in response to the pilot's input
before takeoff AltHold, Loiter, AutoTune, PosHold and Sport flight modes

pair-programmed with Randy Mackay
AP_RangeFinder_PX4_test: Removed out of date PX4 range finder device example
AP_RangeFinder: Removed the use of type Auto
AP_RangeFinder: Changed sonar to rangefinder in the parameter descriptions
ArduCopter Parameters: Changed the SONAR prefix to RNGFND, renamed SONAR_GAIN, and CH6-8 value descriptions
ArduPlane Parameters: Changed the SONAR prefix to RNGFND
Ardurover2 Parameters: Changed the SONAR prefix to RNGFND and renamed the previous SONAR_ parameters
AP_RangeFinder_PX4: Added the destructor to close the file descriptor
AP_RangeFinder_PulsedLightLRF: Modified to do a 2 byte transfer for the distance read