added fixed interval smoothing

code/particles/MyState.h

@@ -23,6 +23,12 @@ struct MyState {
 	// the grid-walk state
 	GridWalkState<MyGridNode> walkState;
 
+    // cumulative heading
+    double cumulativeHeading;
+
+    // save last hPa measurement for the smoothing process
+    double measurement_pressure;
+
 	//int distanceWalkedCM;