AP_InertialNav: remove unused velocity fns

remove get_longitude_velocity and get_latitude_velocity

libraries/AP_InertialNav/AP_InertialNav.cpp

@@ -269,28 +269,6 @@ float AP_InertialNav::get_longitude_diff() const
     return (_position.y / _lon_to_cm_scaling);
 }
 
-// get velocity in latitude & longitude directions
-float AP_InertialNav::get_latitude_velocity() const
-{
-    // make sure we've been initialised
-    if( !_xy_enabled ) {
-        return 0;
-    }
-
-    return _velocity.x;
-    // Note: is +_velocity.x the output velocity in logs is in reverse direction from accel lat
-}
-
-float AP_InertialNav::get_longitude_velocity() const
-{
-    // make sure we've been initialised
-    if( !_xy_enabled ) {
-        return 0;
-    }
-
-    return _velocity.y;
-}
-
 // set_velocity_xy - set velocity in latitude & longitude directions (in cm/s)
 void AP_InertialNav::set_velocity_xy(float x, float y)
 {

libraries/AP_InertialNav/AP_InertialNav.h

@@ -144,24 +144,6 @@ public:
      * @return difference in 100 nano degrees (i.e. degree value multiplied by 10,000,000)
      */
     float       get_longitude_diff() const;
-    
-    /**
-     * get_latitude_velocity - returns the current velocity in latitude direction.
-     *
-     * @see get_velocity().x
-     *
-     * @return : latitude velocity in cm/s
-     */
-    float       get_latitude_velocity() const;
-
-    /**
-     * get_longitude_velocity - returns the current velocity in longitude direction.
-     *
-     * @see get_velocity().y
-     *
-     * @return : longitude velocity in cm/s
-     */
-    float       get_longitude_velocity() const;
 
     /**
      * get_velocity - returns the current velocity in cm/s