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/LabyModel.java

@@ -14,7 +14,7 @@ import java.io.DataInputStream;
 /**
  * Model of labyrinth storing only paths not walls. wall are regenerated later
  * on based on adjacent paths. each position (x,y) stores what move can be done
- * from here to go do deeper path. a node is tagged OPEN and contained in
+ * from here to go to deeper path. a node is tagged OPEN and contained in
  * openList if all moves from its position have not been resolved a node is
  * tagged CLOSED when fully processed
  **/