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

floorplan/Stair.h

@@ -4,10 +4,11 @@
 #include "../geo/BBox2.h"
 #include "../geo/Point2.h"
 
+/** a simple stair with a slope from A to B */
 struct Stair {
 
-	/** bbox with all starting points */
-	BBox2 from;
+	/** starting line of the stair */
+	Line2 start;
 
 	/** the direction to move all the starting points to */
 	Point2 dir;