many changes and updates

- changed the wifi-estimation api
- adjusted test-cases
- worked on grid-bulding and grid-importance
- new walking modules
- fixed some minor issues

tests/grid/GridWalk2RelPressure.cpp

@@ -39,7 +39,7 @@ struct MyState : public WalkState, public WalkStateRelativePressure {
 
 
 
-TEST(GridWalk2RelPressure, walkHeading) {
+TEST(GridWalk2RelPressure, LIVE_walkHeading) {
 
 	Grid<MyNode> grid(20);