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/nav/dijkstra/TestDijkstra.cpp

@@ -59,7 +59,7 @@ void build(Grid<GP>& grid) {
 		}
 	}
 
-	std::set<int> done;
+	//std::set<int> done;
 
 	for (int x = 0; x < size; x += gs) {
 		for (int y = 0; y < size; y += gs) {
@@ -69,17 +69,19 @@ void build(Grid<GP>& grid) {
 
 			for (int x1 = -gs; x1 <= +gs; x1 += gs) {
 				for (int y1 = -gs; y1 <= +gs; y1 += gs) {
+				if (x1 == 0 && y1 == 0) {continue;}		// the node itself
 					const GridPoint gp2(x+x1, y+y1, 0);
 					if (grid.hasNodeFor(gp2)) {
 						int idx2 = grid.getNodeFor(gp2).getIdx();
-						if (done.find(idx2) != done.end()) {continue;}
-						grid.connectBiDir(idx1, idx2);
+						//if (done.find(idx2) != done.end()) {continue;}
+						//grid.connectBiDir(idx1, idx2);
+						grid.connectUniDir(idx1, idx2);
 					}
 
 				}
 			}
 
-			done.insert(idx1);
+			//done.insert(idx1);
 
 		}
 	}