Copter: add Circle parameter
Copter: control_circle.pde added
Copter: add AC_Circle include
Copter: ACRO further clean up
AC_PosControl: make some methods const
Copter: mostly working circle flight mode
Copter: add circle to control_auto
Copter: integrate circle mission command
Copter: remove old circle
Copter: add rtl to control_auto
Copter: auto_mode to global scope
Copter: commands_logic to use auto_rtl
Copter: remove comments
Copter: bug fix for do_loiter_time alt target
Copter: drift moved to control_drift
Copter: sport moved to control_sport.pde
Copter: althold moved to control_althold.pde
Copter: removed althold, drift, sport from control_stabilize
Copter: control_guided added
Copter: remove guided from control_auto.pde