create lab directory in parent

abstract MazeParams to be able to set them easily
doit.sh support new class creation
updated README

Signed-off-by: philippe lhardy <philippe@pavilionartlogiciel>

java/org/artisanlogiciel/games/LabyModel.java

@@ -74,6 +74,15 @@ implements WallsProvider
 	t= new short[width][height];
     }
 
+    public LabyModel(MazeParams params, Random random){
+	this.width=params.getWidth();
+	this.height=params.getHeight();
+	this.maxdepth=params.getMaxDepth();
+	this.random = random;
+	// CLEAR == 0 and array is initialized with 0s
+	t= new short[width][height];
+    }
+
     public LabyModel(String pFormat, InputStream pIn)
 	throws IOException
     {