new test cases

worked on all walkers
new helper methods
new distributions
some bugfixes

grid/factory/GridFactory.h

@@ -198,7 +198,8 @@ public:
 	/** build a stair (z-transition) from n1 to n2 */
 	void buildStairLine(T& _n1, T& _n2) {
 
-		const int gridSize_cm = grid.getGridSize_cm();
+		// half the grid size = small steps
+		const int gridSize_cm = grid.getGridSize_cm() / 2;
 
 		// local copies, needed for std::swap to work
 		T n1 = _n1; T n2 = _n2;