auth-basic.txt isn't quite ready for prime-time yet.  There is currently
only one realm for the entire server and it will always ask the user
for a login/password.

The configuration file is just:
    user:password
    sanders:example

And goes in the server directory as $realm-auth-realm (where $realm is
defined in local.conf as ``set basic-realm whatever'').

This will evolve into a more configurable form soon.
