Git commits in Moodle 2.1.6 by Hugh Davenport

commit 4d6bcdad3ef436745a53332278695ce16a94f7c1
Author: Hugh Davenport <hugh@catalyst.net.nz>
Date:   Tue, 10 Apr 2012 01:03:45 +0800
Tag:    v2.1.6

MDL-32308 Fix error when testing id of guest user