If this flag is enabled, the library expects bookmarks to be added to
the account itself, and when there's no bookmark for a room, the
corresponding room is automatically left. This doesn't work in the case
where many instances of the bot are on the same account.
It may work in the future if support for various sets of rooms/hooks are
added, but for the moment it seemed easier (and maybe also more useful
for other users of the xmpp-rs lib) to implement this.
Signed-off-by: pep <pep@bouah.net>
