F4BY: compass does not work
Merge branch 'f4by-dev' into diy_trunk
Fix ArduCopter and LED communication
F4BY does not write logs to flash card
Merge branch 'f4by-dev' into diy_trunk

Conflicts:
	libraries/AP_HAL/AP_HAL_Boards.h
	libraries/AP_HAL_F4BY/Util.cpp