blog admin: settings: ping

[erwin]

Allow the blog owner to specify URL's of xmlrpc blog ping services. (like technorati)

Those URL's should then be called after each update. (e.g. added blogentry)

The xml to send should look like this:

<?xml version="1.0"?>
<methodCall>
 	<methodName>weblogUpdates.ping</methodName>
 	<params>
 	<param>
 	<value>Name of the blog</value>
 	</param>
 	<param>
 	<value>URL of the blog</value>
 	</param>
 	</params>
 	</methodCall>