HAL_AVR: fixed warning
Plane: disable CLI by default

it really isn't needed any more, and saves 20k of flash on APM2
Plane: display min as well as max loop delta_t
AP_L1_Control: fixed some warnings
AP_TECS: fixed some warnings
AP_Terrain: fixed a warning
Copter: landing detector checks baro climb rate

Barometer climb rate must be -150cm/s ~ +150cm/s
This threshold is generous because we already use the inertial
navigation climb rate so this is just to catch cases where inertial nav
is very incorrect in it's climbrate estimates
DataFlash: log baro climbrate
AP_CompassMot: Initial commit
AP_Compass: Hook up an AP_CompassMot to each compass instance
ArduCopter: Supply AP_Compass with necessary data for AP_CompassMot