Copter: typo in release notes
APM_Control: re-work to allow for rate based control
Plane: added initial implementation of ACRO mode

rate based control with attitude locking
Plane: added ACRO_ROLL_RATE and ACRO_PITCH_RATE parameters

default to 180 degrees/second, which seems reasonable
Plane: added ACRO mode to mode choices
Copter: default Loiter Pos P to 0.8 (was 0.2)