Ajout fonctionnalité bouton extremités

shukan/ShukanController.java

@@ -215,14 +215,20 @@ public class ShukanController
     else if (e.getSource()==bar.buttons[5]) {if (data.followRight ()) canvas.repaint ();}
 
     else if (e.getSource()== bar.buttons[6])
+    {
+      data.exchangeExtremes ();
+      canvas.repaint ();
+    }
+
+    else if (e.getSource()== bar.buttons[7])
     {
       data.toggleCursus(false);
       canvas.repaint();
     }
       //if (data.followRight ()) canvas.repaint ();
-    else if (e.getSource()==bar.buttons[7])
+    else if (e.getSource()==bar.buttons[8])
       new ShukanTex (data);
-    else if (e.getSource()==bar.buttons[8]){
+    else if (e.getSource()==bar.buttons[9]){
     
       EventQueue.invokeLater(() -> {
         ShukanParameters myParameters = new ShukanParameters("Changer de thème", canvas);