APM: rename RDRSTEER to WHEELSTEER

thanks to Jon for the suggestion

ArduPlane/Attitude.pde

@@ -177,7 +177,7 @@ static void calc_nav_yaw(float speed_scaler)
 
     if (hold_course != -1) {
         // steering on or close to ground
-        g.channel_rudder.servo_out += g.pidRdrSteer.get_pid(bearing_error_cd);  
+        g.channel_rudder.servo_out += g.pidWheelSteer.get_pid(bearing_error_cd);  
     } else {
         // a PID to coordinate the turn (drive y axis accel to zero)
         Vector3f temp = imu.get_accel();

ArduPlane/Parameters.h

@@ -198,7 +198,7 @@ public:
         k_param_pidServoRudder,
         k_param_pidTeThrottle,
         k_param_pidNavPitchAltitude,
-        k_param_pidRdrSteer,
+        k_param_pidWheelSteer,
 
         // 254,255: reserved
     };
@@ -344,7 +344,7 @@ public:
     PID         pidServoRudder;
     PID         pidTeThrottle;
     PID         pidNavPitchAltitude;
-    PID         pidRdrSteer;
+    PID         pidWheelSteer;
 
     Parameters() :
 	// variable				default
@@ -372,7 +372,7 @@ public:
         pidServoRudder      (SERVO_YAW_P,     SERVO_YAW_I,     SERVO_YAW_D,     SERVO_YAW_INT_MAX),
         pidTeThrottle       (THROTTLE_TE_P,   THROTTLE_TE_I,   THROTTLE_TE_D,   THROTTLE_TE_INT_MAX),
         pidNavPitchAltitude (NAV_PITCH_ALT_P, NAV_PITCH_ALT_I, NAV_PITCH_ALT_D, NAV_PITCH_ALT_INT_MAX_CM),
-        pidRdrSteer         (0, 0, 0, 0)
+        pidWheelSteer         (0, 0, 0, 0)
         {}
 };
 

ArduPlane/Parameters.pde

@@ -515,7 +515,7 @@ const AP_Param::Info var_info[] PROGMEM = {
 	GGROUP(pidServoRudder,          "YW2SRV_",    PID),
 	GGROUP(pidTeThrottle,           "ENRGY2THR_", PID),
 	GGROUP(pidNavPitchAltitude,     "ALT2PTCH_",  PID),
-	GGROUP(pidRdrSteer,             "RDRSTEER_",  PID),
+	GGROUP(pidWheelSteer,           "WHEELSTEER_",PID),
 
 	// variables not in the g class which contain EEPROM saved variables