Git commits in Moodle 2.2.3 by Tim Lock

commit da496c52f8150eaa7a3bb25d614cc1ae9f5bd7d0
Author: Tim Lock <tim.lock@netspot.com.au>
Date:   Mon, 05 Mar 2012 09:48:58 +0800
Tag:    v2.2.3

MDL-31869: Searching for users in messaging with multiple roles generates a warning