some fixes [multithreading,..]

needed interface changes [new options]
logger for android
wifi-ap-optimization
new test-cases

nav/dijkstra/Dijkstra.h

@@ -30,7 +30,7 @@ public:
 	}
 
 	/** get the dijkstra-pendant for the given user-node. null if none matches */
-	DijkstraNode<T>* getNode(const T& userNode) const {
+	const inline DijkstraNode<T>* getNode(const T& userNode) const {
 		auto it = nodes.find(&userNode);
 		return (unlikely(it == nodes.end())) ? (nullptr) : (it->second);
 	}

nav/dijkstra/DijkstraPath.h

@@ -20,6 +20,11 @@ private:
 
 public:
 
+	/** empty ctor */
+	DijkstraPath() {
+		;
+	}
+
 	/** ctor from end- to start-node */
 	DijkstraPath(const DijkstraNode<T>* end, const DijkstraNode<T>* start) {