mavlinkbridge: insert some blank lines to enhance readability
mavlinkbridge: added comments to mavlink data tags
mavlinkbridge: fixed calculation of GPS lat and long
mavlinkbridge: added SystemStats.FlightTime
mavlinkbridge: made gps_fix_type safe for enum changes
mavlinkbridge: added gpsPosData.Groundspeed
mavlinkbridge: added gpsPosData.HDOP and gpsPosData.VDOP
mavlinkbridge: added gpsPosData.Heading
mavlinkbridge: added systemStats.CPULoad
mavlinkbridge: set uav_type to MAV_TYPE_GENERIC
mavlinkbridge: changed armed_mode handling to reflect being a bitmask
mavlinkbridge: use MAV_DATA_STREAM_POSITION and add homeLocation
mavlinkbridge: fixed scale of actDesired.Throttle
mavlinkbridge: add barometric altitude if present
mavlinkbridge: handled battery voltage and current properly
mavlinkbridge: fixed scale of gps altitude
mavlinkbridge: fixed vfr heading
INS: Add flag to override the bias

The EKF seems to be easy to destabilize while initializing.  This might
be related to being unobservable and the bias drifting around so this
makes it possible to force the EKF bias to zero.
INS: Add UAVO to inspect state and covariance diagonal

This probably shouldn't stay in forever but being able to directly
inspect the INS state and at least the diagonal of the variance
will prove useful.

Conflicts:
	flight/targets/Freedom/UAVObjects.inc
INS: Remove updates of the gyro bias

Trying to get rid of the oscillations that often occur on warmup.
However forcing the bias term to zero and not propagating the
uncertainty of it doesn't seem to help.