Improved logout with HTTP authentication

[wavexx]

http://thread.gmane.org/gmane.comp.web.dl-ticket-service.general/349

Summary: in order to show the text on logout, just show the logout boilerplate first, then actually logout with a meta-refresh.

Possibility: maybe now it's actually possible to perform an useless AJAX request to make the browser forget the credentials while still hiding the auth. prompt.