Send current local position estimate as well

src/modules/uORB/topics/home_position.h

@@ -59,10 +59,13 @@ struct home_position_s
 {
 	uint64_t timestamp;			/**< Timestamp (microseconds since system boot)	*/
 
-	//bool altitude_is_relative;	// TODO what means home relative altitude? we need clear definition of reference altitude then
 	double lat;				/**< Latitude in degrees 			*/
 	double lon;				/**< Longitude in degrees			*/
 	float alt;				/**< Altitude in meters				*/
+
+	float x;				/**< X coordinate in meters			*/
+	float y;				/**< Y coordinate in meters			*/
+	float z;				/**< Z coordinate in meters			*/
 };
 
 /**