DisOrder user management

I've been rewriting DisOrder's user management code lately. In the next version the web interface will use cookies instead of HTTP basic authentication and there is a flexible system of user rights behind the scenes.

What you get when you initially visit the web interface is now, instead of a blunt demand for a username and password, read-only access. In fact the administrator can open this up a bit, for instance giving guests the ability to scratch randomly chosen tracks but not those specifically requested by someone.

There is also a registration page where you can create yourself a new login automatically. This can be disabled for sites that would rather a human was in the loop for any new logins.

The full design can be found here but if you don't want to read that, have some screenshots instead:

( Screenshots )