Copter: remove ch6 tuning of INAV_TC

Users normally never change these parameters and if by chance they do want
to, they can set them before flying

ArduCopter/ArduCopter.pde

@@ -1556,12 +1556,6 @@ static void tuning(){
         ahrs._kp.set(tuning_value);
         break;
 
-    case CH6_INAV_TC:
-        // To-Do: allowing tuning TC for xy and z separately
-        inertial_nav.set_time_constant_xy(tuning_value);
-        inertial_nav.set_time_constant_z(tuning_value);
-        break;
-
     case CH6_DECLINATION:
         // set declination to +-20degrees
         compass.set_declination(ToRad((2.0f * g.rc_6.control_in - g.radio_tuning_high)/100.0f), false);     // 2nd parameter is false because we do not want to save to eeprom because this would have a performance impact

ArduCopter/Parameters.pde

@@ -361,7 +361,7 @@ const AP_Param::Info var_info[] PROGMEM = {
     // @DisplayName: Channel 6 Tuning
     // @Description: Controls which parameters (normally PID gains) are being tuned with transmitter's channel 6 knob
     // @User: Standard
-    // @Values: 0:None,1:Stab Roll/Pitch kP,4:Rate Roll/Pitch kP,5:Rate Roll/Pitch kI,21:Rate Roll/Pitch kD,3:Stab Yaw kP,6:Rate Yaw kP,26:Rate Yaw kD,14:Altitude Hold kP,7:Throttle Rate kP,34:Throttle Accel kP,35:Throttle Accel kI,36:Throttle Accel kD,42:Loiter Speed,12:Loiter Pos kP,22:Loiter Rate kP,28:Loiter Rate kI,23:Loiter Rate kD,10:WP Speed,25:Acro RollPitch kP,40:Acro Yaw kP,9:Relay On/Off,13:Heli Ext Gyro,17:OF Loiter kP,18:OF Loiter kI,19:OF Loiter kD,30:AHRS Yaw kP,31:AHRS kP,32:INAV_TC,38:Declination,39:Circle Rate,41:RangeFinder Gain,46:Rate Pitch kP,47:Rate Pitch kI,48:Rate Pitch kD,49:Rate Roll kP,50:Rate Roll kI,51:Rate Roll kD,52:Rate Pitch FF,53:Rate Roll FF,54:Rate Yaw FF
+    // @Values: 0:None,1:Stab Roll/Pitch kP,4:Rate Roll/Pitch kP,5:Rate Roll/Pitch kI,21:Rate Roll/Pitch kD,3:Stab Yaw kP,6:Rate Yaw kP,26:Rate Yaw kD,14:Altitude Hold kP,7:Throttle Rate kP,34:Throttle Accel kP,35:Throttle Accel kI,36:Throttle Accel kD,42:Loiter Speed,12:Loiter Pos kP,22:Loiter Rate kP,28:Loiter Rate kI,23:Loiter Rate kD,10:WP Speed,25:Acro RollPitch kP,40:Acro Yaw kP,9:Relay On/Off,13:Heli Ext Gyro,17:OF Loiter kP,18:OF Loiter kI,19:OF Loiter kD,30:AHRS Yaw kP,31:AHRS kP,38:Declination,39:Circle Rate,41:RangeFinder Gain,46:Rate Pitch kP,47:Rate Pitch kI,48:Rate Pitch kD,49:Rate Roll kP,50:Rate Roll kI,51:Rate Roll kD,52:Rate Pitch FF,53:Rate Roll FF,54:Rate Yaw FF
     GSCALAR(radio_tuning, "TUNE",                   0),
 
     // @Param: TUNE_LOW

ArduCopter/defines.h

@@ -133,7 +133,7 @@
 #define CH6_OPTFLOW_KD                  19  // optical flow loiter controller's D term (position error to tilt angle)
 #define CH6_AHRS_YAW_KP                 30  // ahrs's compass effect on yaw angle (0 = very low, 1 = very high)
 #define CH6_AHRS_KP                     31  // accelerometer effect on roll/pitch angle (0=low)
-#define CH6_INAV_TC                     32  // inertial navigation baro/accel and gps/accel time constant (1.5 = strong baro/gps correction on accel estimatehas very strong does not correct accel estimate, 7 = very weak correction)
+#define CH6_INAV_TC                     32  // deprecated -- remove
 #define CH6_DECLINATION                 38  // compass declination in radians
 #define CH6_CIRCLE_RATE                 39  // circle turn rate in degrees (hard coded to about 45 degrees in either direction)
 #define CH6_SONAR_GAIN                  41  // sonar gain