User-visible changes:
- checks will fail if calibration is in progress
- PX4FMU_V1 will now have COMPASS_OFFSETS_MAX of 600, not 500
- if the primary compass is not set to be used then compass checks will always pass
Functionality changes:
- gyros and accels only have to be consistent in last 10 seconds to pass
- ins.use_accel() is honoured when checking for consistency
- ins.use_gyro() is honoured when checking for consistency
- threshold is trippled rather than doubled for accel cal checks
- checks are reordered