retry implemented

gui/griffon-app/controllers/com/muwire/gui/MainFrameController.groovy

@@ -90,6 +90,12 @@ class MainFrameController {
         downloader.cancel()
     }
     
+    @ControllerAction
+    void resume() {
+        def downloader = selectedDownload()
+        downloader.resume()
+    }
+    
     void mvcGroupInit(Map<String, String> args) {
         application.addPropertyChangeListener("core", {e-> 
             core = e.getNewValue()

gui/griffon-app/views/com/muwire/gui/MainFrameView.groovy

@@ -99,7 +99,7 @@ class MainFrameView {
                                 }
                                 panel (constraints : BorderLayout.SOUTH) {
                                     button(text: "Cancel", enabled : bind {model.cancelButtonEnabled }, cancelAction )
-                                    button("Retry", enabled : bind {model.retryButtonEnabled})
+                                    button(text: "Retry", enabled : bind {model.retryButtonEnabled}, resumeAction)
                                 }
                             }
                         }