load .we with layers

- and fix some bug : max is within range ( perhaps not as many as those added ...)
- quick hack in CharProvider to skip spaces ... ( bad it applies to strings too ...)

java/org/artisanlogiciel/games/maze/LabyLayers.java

@@ -15,6 +15,7 @@ extends Range
     }
     public void addLabyModel(int z, LabyModel model)
     {
+        updateBounds(z);
         layers.put(new Integer(z), model);
     }