prepare for hexagon display & other models

- display cell as hexagon is Display.mHexagon if set ( not default )
will need a checkbox to set this
- various new models preparation...

java/org/artisanlogiciel/games/maze/Brick.java

@@ -26,10 +26,12 @@ public class Brick
     public final static short ENTRY = 16;
     public final static short GOAL = 32;
 
+    // TODO get rid of those chars
     char a;
     char b;
     char c;
     char d;
+
     short walls; // according to LabyModel.getWalls();
 
     protected Brick()
@@ -46,6 +48,11 @@ public class Brick
         this.walls = walls;
     }
 
+    public static boolean isFlagSet(short flags, short wall)
+    {
+        return ( flags & wall ) == flags;
+    }
+
     public String getUpString()
     {
         return "" + a + b;