Git commits in Moodle 2.3.x by Anthony Borrow

commit b31f52340c53aa05145dc1dd05f87d5a822d9a85
Author: Anthony Borrow <anthony@moodle.org>
Date:   Thu, 03 Jan 2013 11:03:06 +0800
Tag:    v2.3.5

MDL-15930 - admin: reorganize logic to allow ->fullnamedisplay to be used as default sort.