dup_presence_statuses

Return the presence statuses that might be supported by connections to this protocol.

It is possible that some of these statuses will not actually be supported by a connection: for instance, an XMPP connection manager would include "hidden" in this list, even though not all XMPP servers allow users to be online-but-hidden.

Parameters:

this	a protocol object

Returns:

a list of statuses, or null if unknown