Show the configuration window, or deiconify (un-minimise) it if it's already open.

def show_configure(self):
        """
        Show the configuration window, or deiconify (un-minimise) it if it's already open.
        """
        logging.info("Displaying configuration window")
        self.configWindow.show()
        self.configWindow.showNormal()
        self.configWindow.activateWindow()