Tokens get invalidated from time to time. It is therefore better to use
passwords and let listunserv log itself in.

The exact parameters to send to the login form where obtained by
studying the request the login page sends.

The grep | cut | cut commands extracts the login token from the
response after the login. The token is found in the URL of a <meta>
refresh tag.

The KU Leuven mailing list are regenerated every day. So in order to
prevent anoying mails from reaching our already quite full mailboxes, we
can just mute te list periodically.