- Fix the incompatibility with
	http://www.semiologic.com/software/opt-in-front/
- Provide an alternative user interface for setting the order, where the user
	first provides integers for the order, then does the indenting. (Suggested
	by Josephine J.K. Tan <jookhim.tan@gmail.com>.)
- Use AJAX for the management interface so that it doesn't refresh all the
	time.
