Copter: add AUTOTUNE_AGGR parameter

ArduCopter/Parameters.h

@@ -316,6 +316,7 @@ public:
         k_param_acro_balance_pitch,
         k_param_acro_yaw_p, // 244
         k_param_autotune_axis_bitmask,  // 245
+        k_param_autotune_aggressiveness,  // 246
 
         // 254,255: reserved
     };
@@ -465,6 +466,7 @@ public:
 
     // Autotune
     AP_Int8                 autotune_axis_bitmask;
+    AP_Float                autotune_aggressiveness;
 
     // Note: keep initializers here in the same order as they are declared
     // above.

ArduCopter/Parameters.pde

@@ -1044,6 +1044,13 @@ const AP_Param::Info var_info[] PROGMEM = {
     // @User: Standard
     GSCALAR(autotune_axis_bitmask, "AUTOTUNE_AXES", 7),  // AUTOTUNE_AXIS_BITMASK_DEFAULT
 
+    // @Param: AUTOTUNE_AGGRESSIVENESS
+    // @DisplayName: autotune_aggressiveness
+    // @Description: autotune_aggressiveness. Defines the bounce back used to detect size of the D term.
+    // @Range: 0.05 0.10
+    // @User: Standard
+    GSCALAR(autotune_aggressiveness, "AUTOTUNE_AGGR", 0.05f),
+
     AP_VAREND
 };