refactored the new floorplan

new helper methods/operator toe geo classes

geo/BBox2.h

@@ -70,6 +70,12 @@ public:
 		return true;
 	}
 
+	/** grow the bbox by the amount given for each dimension */
+	void grow(const Point2& p) {
+		p1 -= p;	// decrease minimum
+		p2 += p;	// increase maximum
+	}
+
 };
 
 #endif // BBOX2_H