Rover: added RC in/out logging
AP_AHRS: changed default GPS lag to 1 sample

this is based on detailed logs from a LEA-6H and NEO-7N
Rover: split up GPS update into 10Hz and 50Hz parts
Rover: prepare for 2.44 release
AP_Math: added vectorN class, and index checking
AP_Math: prevent transpose usage error in matrix API
AP_Math: add const to quaternion API
AP_HAL: added time_shift() scheduler API

used for log replay
HAL_Linux: implement time_shift() API
AP_GPS: allow HIL GPS to show no lock
AP_Compass: added vector compass setHIL method
Inertial Navigation Code - 24 State EKF
Renamed .c to .cpp
Misc Updates
Misc Updates
Misc updates
Updated GPS input processing
Updated measurement fusion control
Corrected height update timeout error
Added constructor for measurements