Git commits in Moodle 2.8.3 by sam marshall

commit b749aaa935b93e17128d25eceecb4f1261f7ef12
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Mon, 05 Jan 2015 23:46:09 +0800
Tag:    v2.8.3

MDL-48660 Availability: filter_user_list() should respect 'view hidden'