Change Success messange and remove timeout

Now the message after a successful execution never goes away and
the user has to dismiss it (hopefully after reading it).
closes #32

Author: sergiobuj

clusterpy_lightdialog.py

@@ -145,8 +145,8 @@ def finishRun(self, success, outputmsg):
         self.okbutton.setEnabled(True)
         if success:
             self.addToCanvas()
-            self.showMessage("Clusterpy", "Success. File:" + outputmsg,
-                                duration=10 )
+            output_msg = "Success. New column added to attribute table. " + outputmsg
+            self.showMessage("Clusterpy", output_msg, duration=0 )
         else:
             self.showMessage("Clusterpy Error",
                                         outputmsg,
@@ -162,4 +162,3 @@ def showMessage(self, msgtype, msgtext, level=QgsMessageBar.INFO,
                                             duration=30):
         messagebar = self.iface.messageBar()
         messagebar.pushMessage(msgtype, msgtext, level=level, duration=duration)
-