AntennaTracker: added sending on SIMSTATE in SITL
autotest: raise turn rate of antennas
autotest: kill off old tasks on exit
Rover: fixed comment
Plane: print PX4 compass type
AP_Compass: fixed showing of is_external for 2nd compass
AP_NavEKF : Update comments and remove un-used function declarations
AP_NavEKF : Use synthetic sideslip fusion during GPS denied operation with airspeed
AP_NavEKF : Prevent bad user parameter causing incorrect GPS fusion
AP_NavEKF : Update default tuning parameters (for plane use)
AP_GPS: removed nav_setting default

not needed, and apparently caused issue with xcode 5.1
Plane: altitude for do_set_home() is in meters
RC_Channel: constrain norm_input() to -1 to 1

if RC is not properly calibrated we could get a value beyond 1, which
could cause some flight modes to exceed the roll/pitch limits of the
aircraft
Plane: use set_mode() in do_RTL()

thanks to Randy for spotting this
AP_GPS: fixed example builds with change to init()
Git: ignore test.ArduPlane, test.APMrover2

Remove redundant dataflash.bin and eeprom.bin which are already covered
by *.bin exclusion
Copter: fixed vertical speed init for ALT_HOLD mode
AC_PosControl: fixed leash length calc for descent speed
AC_PosControl: update some comments re leash lengths
Copter: initialise vertical speed for Loiter mode