Tiny tweaks for Linux

kcc.py

@@ -117,7 +117,7 @@ class QApplicationMessaging(QtWidgets.QApplication):
             self._server.newConnection.connect(self.handleMessage)
             self._server.listen(self._key)
 
-    def __del__(self):
+    def shutdown(self):
         if self._memory.isAttached():
             self._memory.detach()
             self._server.close()