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")
        if self.configWindow is None:
            self.configWindow = ConfigWindow(self)
            self.configWindow.show()
        else:
            self.configWindow.deiconify()