HAL_PX4: added new arming ioctls
Copter: add pre_arm_rc_check

Motors are not be enabled unless we have passed rc checks which include
checking the radio in calibration has been performed.
Merge branch 'master' of https://github.com/diydrones/ardupilot
corrected format string

ArduCopter/AP_State.pde:139:42: warning:
format '%u' expects argument of type 'unsigned int', but argument 3 has
type 'uint32_t {aka long unsigned int}' [-Wformat]

these warnings exist for a reason ...