AP_InertialSensor: Flymaple filter constructor arguments non non-zero
AP_HAL_FLYMAPLE: Modest speed improvements to I2CDriver

Can now achieve about 285kHz using bitbanging.
Proper low-level hardware I2C support has been written and stashed,
but has to wait until a bug in libmaple is addressed.
Ref: http://forums.leaflabs.com/topic.php?id=13458
AP_HAL_FLYMAPLE: Improvements to FLYMAPLEStorage

Fix a number of bugs and expand storage to an emulated 4kb, as needed by AP.
AP_HAL_FLYMAPLE: I2CDriver now uses low level hardware i2c librray from
libmaple

CAUTION: requires a patched version of libmaple, to be provided by mikem.
AP_HAL_FLYMAPLE: fix compile error in example AP_Baro_BMP085_test.pde

due to need for new library AP_Notify
AP_HAL_FLYMAPLE: Add test for correct version of libmaple

Patched version of libmapl is required for Flymaple I2Driver to work.
AP_InertialSensor: Improvements to Flymaple sensors

Fix a bug that caused hang after 71 minutes. Use I2CDriver semaphore.
Remove test for in_accumulate: not needed.
AP_HAL_FLYMAPLE: Fixed problem with tx buffer that caused slow parameter
delivery
AP_HAL_FLYMAPLE: update documentation in FlymaplePortingNotes.txt

Added info about where to get my patched version of libmaple.
Copter: mavlink ext status to use abs pressure
Plane: mavlink ext status to use SYS_STATUS_SENSOR enum
Rover: mavlink ext status to use SYS_STATUS_SENSOR enum
Copter: Leonard's AutoTuning for Roll and Pitch
Copter: make AutoTune a compile-time option
Rover: allow throttle nudging in STEERING mode

this better matches what AUTO does
APM_Control: added rate and angle steering controllers
Rover: update for new AP_SteerController API
APM_Control: remove public AP_PitchController::get_coordination_rate_of|cat()
APM_Control: enable integrator in ACRO rate controller

this work better for unlocked mode
Plane: added ACRO_LOCKING parameter

this enables/disables the attitude locking in acro mode, allowing acro
to be a pure rate controller