honor run option with a default maze of 30x30

default_args in project
Display.main()
  if argument is empty ignore it
  if file read fails, exit
add a WHEREWHAT file
extract MazeParamEditor to share it, prepare for having a GUI instead of console

java/org/artisanlogiciel/games/MazeParamEditor.java

@@ -0,0 +1,59 @@
+package org.artisanlogiciel.games;
+
+import java.io.File;
+import java.util.Scanner;
+
+/**
+ MazeParamEditor to edit Maze Parameters ( current impl in console / Scanner )
+ **/
+class MazeParamEditor implements MazeParams
+{
+    int width;
+    int height;
+    int maxdepth;
+    File labdir;
+    String name;
+
+    public MazeParamEditor(File saveDir)
+    {
+	name = null;
+	labdir = saveDir;
+    }
+
+    public void read(Scanner console)
+    {
+	width = console.nextInt();
+	height = console.nextInt();
+	maxdepth = console.nextInt();
+    }
+
+    public int getWidth()
+    {
+	return width;
+    }
+
+    public int getHeight()
+    {
+	return height;
+    }
+
+    public int getMaxDepth()
+    {
+	return maxdepth;
+    }
+    
+    public String getName()
+    {
+	if (name == null)
+            {
+                name = "lab" + width + "x" + height;
+            }
+	return name;
+    }
+
+    public File getSaveDir()
+    {
+	return labdir;
+    }
+}
+