AC_Avoid: reduce min and default DIST_MAX values

libraries/AC_Avoidance/AC_Avoid.cpp

@@ -28,7 +28,7 @@ const AP_Param::GroupInfo AC_Avoid::var_info[] = {
     // @DisplayName: Avoidance distance maximum in non-GPS flight modes
     // @Description: Distance from object at which obstacle avoidance will begin in non-GPS modes
     // @Units: m
-    // @Range: 3 30
+    // @Range: 1 30
     // @User: Standard
     AP_GROUPINFO("DIST_MAX", 3,  AC_Avoid, _dist_max, AC_AVOID_NONGPS_DIST_MAX_DEFAULT),
 

libraries/AC_Avoidance/AC_Avoid.h

@@ -19,7 +19,7 @@
 #define AC_AVOID_DEFAULT                (AC_AVOID_STOP_AT_FENCE | AC_AVOID_USE_PROXIMITY_SENSOR)
 
 // definitions for non-GPS avoidance
-#define AC_AVOID_NONGPS_DIST_MAX_DEFAULT    10.0f   // objects over 10m away are ignored (default value for DIST_MAX parameter)
+#define AC_AVOID_NONGPS_DIST_MAX_DEFAULT    5.0f    // objects over 5m away are ignored (default value for DIST_MAX parameter)
 #define AC_AVOID_ANGLE_MAX_PERCENT          0.75f   // object avoidance max lean angle as a percentage (expressed in 0 ~ 1 range) of total vehicle max lean angle
 
 /*