options to disable ipv6 and bind

[BlairSadewitz]

Err, that should read "bind unspecified address".

On a lot of machines I use, I can't bind ::1, so I have to do --host 127.0.0.1. It would be easier just to type --disable-ipv6. Thanks. It would also be handy to have flag to listen on the unspecified address. A lot of people (like me) still don't have ipv6 connectivity because their cable companies hate subscribers or something, and, while I do have a tunnel, it would be easier just to kill it.