started removing KLib related code:

- assertions
- distributions
new helper methods
worked on stairs
worked on grid-walkers
worked on navigation

geo/BBox2.h

@@ -19,8 +19,12 @@ protected:
 
 public:
 
+	/** empty ctor */
 	BBox2() : p1(MAX,MAX), p2(MIN,MIN) {;}
 
+	/** ctor */
+	BBox2(const Point2& p1, const Point2& p2) : p1(p1), p2(p2) {;}
+
 	/** adjust the bounding-box by adding this point */
 	void add(const Point2& p) {