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/gui/Display.java

@@ -799,7 +799,19 @@ implements StatusListener
                     FileInputStream inputStream = null;
                     try {
                         inputStream = new FileInputStream(infile);
-                        setModel(new MazePersistWorldEdit().parseInputStream("we",inputStream));
+                        LabyLayers newLayers = new MazePersistWorldEdit().parseInputStream("we",inputStream);
+                        if ( ! newLayers.isEmpty()) {
+                            int l = layer;
+                            for (int i = newLayers.getMin(); i <= newLayers.getMax(); i++) {
+                                LabyModel m = newLayers.getLayer(i);
+                                if (m != null) {
+                                    System.out.println("add layer " + l);
+                                    layers.addLabyModel(l, m);
+                                    l++;
+                                }
+                            }
+                            setModel(layers.getLayer(layer));
+                        }
                     } catch (IOException io) {
                         io.printStackTrace(System.err);
                         statusField.setText("[ERROR] Can't load " + infile.getAbsolutePath());