mod_vcard_muc: Add an alternative method of signaling avatar change When the avatar has been changed, a signal is sent that the room configuration has changed. Clients then do a disco#info query to find the SHA-1 of the new avatar. They can then fetch it as before, or not if they have it cached already. This is meant to be less disruptive than signaling via presence, which caused problems for some clients. If clients transition to the new method, the old one can eventually be removed. The namespace is made up while waiting for standardization. Otherwise it is very close to what's described in https://xmpp.org/extensions/inbox/muc-avatars.html

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summary: 'Block remote servers via ad-hoc command'
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Introduction
============

This module provides the *Edit Blacklist* ad-hoc command described in
[XEP-0133](http://xmpp.org/extensions/xep-0133.html#edit-blacklist) and
also performs the actual blocking of incoming and outgoing
server-to-server connections.

Using
=====

In your client, simply select the Edit Blacklist command from the list
of adhoc commands. E.g. in Pidgin, this is under *Accounts -\> (your
account)* in the menu.