AC_Avoid: disable non-GPS avoidance by default

Author: rmackay9

libraries/AC_Avoidance/AC_Avoid.cpp

@@ -114,12 +114,12 @@ const AP_Param::GroupInfo AC_Avoid::var_info[] = {
 
     // @Param{Copter}: ANG_MAX
     // @DisplayName: Avoidance max lean angle in non-GPS flight modes
-    // @Description: Max lean angle used to avoid obstacles while in non-GPS modes
+    // @Description: Max lean angle used to avoid obstacles while in non-GPS modes.  Set to zero to disable lean-based avoidance
     // @Units: deg
     // @Increment: 0.1
     // @Range: 0 45
     // @User: Standard
-    AP_GROUPINFO_FRAME("ANG_MAX", 11,  AC_Avoid, _angle_max_deg, 10.0, AP_PARAM_FRAME_COPTER | AP_PARAM_FRAME_HELI | AP_PARAM_FRAME_TRICOPTER),
+    AP_GROUPINFO_FRAME("ANG_MAX", 11,  AC_Avoid, _angle_max_deg, 0.0, AP_PARAM_FRAME_COPTER | AP_PARAM_FRAME_HELI | AP_PARAM_FRAME_TRICOPTER),
 
     AP_GROUPEND
 };