dijkstra is now bleching fast

deleting from the grid is now bleaching fast
added new helper methods
many new test-cases
many new methods for geo classes and others
added a bunch of new grid-walkers

tests/grid/Plot.h

@@ -140,7 +140,7 @@ public:
 	Plot& fire() {
 		gp.draw(splot);
 		gp.flush();
-		sleep(1000);
+		//sleep(1000);
 		return *this;
 	}
 

tests/grid/TestWalk.cpp

@@ -12,7 +12,7 @@
 #include "../../grid/walk/GridWalkWeighted.h"
 #include "../../grid/walk/GridWalkLightAtTheEndOfTheTunnel.h"
 
-TEST(Walk, plot) {
+TEST(Walk, DISABLED_plot) {
 
 	Grid<GP> g(20);
 	GridFactory<GP> gf(g);