new walker (control+path)

added new sanity checks
fixed minor errors
added corresponding test-cases
added moving-median

tests/grid/Plot.h

@@ -17,6 +17,7 @@ public:
 	float imp = 1.0f;
 	float impPath = 1.0f;
 	float distToTarget = 1.0;
+	int cnt = 0;
 public:
 	GP() : GridNode(), GridPoint() {;}
 	GP(int x, int y, int z) : GridNode(), GridPoint(x,y,z) {;}