Added pitch, roll, and yaw offsets to compensate for imperfect fmu placement. These were removed in 61a3177979838649af2a6e8e50bea7d15e2765f4
WIP: Support in-flight fine tuning of board alignment. Implemented by applying a user supplied rotation matrix via new SENS_BOARD_(PITCH, ROLL, YAW)_OFF params in the sensors app. Currently only tested in QGC.
Removed unused ATT_XXX_OFF3 paramters. Offset tuning now accomplished via the sensors app using new SENS_BOARD_XXX_OFF parameters.
Fixed too-long param names.
Pre-compute board orientation offsets on param update.
Define float params properly: 0.0f instead of just 0
Clarified parameter comments and added @group attributed for auto-generation.
Merge remote-tracking branch 'origin/master' into offset_tuning
Merge pull request #1063 from pigeonhunter/offset_tuning

Offset tuning implemented in sensors app