Copter: integrate control_flip
Copter: remove unused flip.pde
Copter: add control_autotune.pde
Copter: integrate control_autotune
Copter: remove unused auto_tune.pde
Copter: comment fix for control_stabilize
Copter: APM_Config AUTOTUNE_ENABLED
Copter: AttControl param prefix shortened to ATC
AP_Math: float versions of wrap_360 and wrap_180
Copter: integrate slew_yaw into control_auto
Copter: compiler warning for control_autotune
Copter: remove unused drift.pde

moved to control_drift.pde
Copter: remove deadwood, update_thr_cruise always runs
Copter: update_thr_cruise removed from control_stabilize
Copter: remove set_nav_mode
Copter: remove unused flags and variables
Copter: surface_tracking takes current_alt_target param
Copter: get angle_boost direct from pos_control
Copter: integrate surface_tracking to control_althold
Copter: crash check works with flip flight mode