* default with 60,60,15 labyrinth

* display labyrinth at re-recreation.
* save only labyrinth view ( png without background ).

java/org/artisanlogiciel/games/stl/Wall3d.java

@@ -123,6 +123,9 @@ public class Wall3d
 
     }
 
+    /**
+       write triangles as stl text
+     **/
     public String toString()
     {
         String s = "";