Patch against centericq-4.20.0

This patch includes both of the following:
	centericq-4.20.0-jabber_groupchat_doublesend.patch
	centericq-4.20.0-jabber_nullsubject.patch

For more information, please see the accompanying text files:
	centericq-4.20.0-jabber_groupchat_doublesend.patch.txt
	centericq-4.20.0-jabber_nullsubject.patch.txt