added several grid-walks

added new helper methods/classes (e.g. for heading)
new test cases
optimize the dijkstra
cleanups/refactoring
added timed-benchmarks to the log
many more...

grid/walk/GridWalkHelper.h

@@ -0,0 +1,17 @@
+#ifndef GRIDWALKHELPER_H
+#define GRIDWALKHELPER_H
+
+#include "../../geo/Heading.h"
+
+class GridWalkHelper {
+
+public:
+
+	/** get the heading-change between the two given locations */
+	template <typename T> static Heading getHeading(const T& from, const T& to) {
+		return Heading(from.x_cm, from.y_cm,  to.x_cm, to.y_cm);
+	}
+
+};
+
+#endif // GRIDWALKHELPER_H