AP_HAL: removed unused enable_mask and disable_mask functions
Plane: check both ground and airspeed in autocal test

when the airspeed ratio is far too low we were not raising it as the
airspeed was never getting above the minimum airspeed

Pair-Programmed-With: Jon Challinger
INS: check for good calibration for 10seconds

Shortened gyro calibration commit also halved the total time we would
look for a good gyro calibration.  This restores the total time to 10
seconds.
HAL_AVR: fixed build
Copter: add inav vs baro arming check

In-flight Barometer sanity checking will be a more complete solution but
until then this should catch some bad pre-flight barometer behaviour
Copter: lean angle arming check
Param doc typo