Git commits in Moodle 2.7.3 by Andrew Davis

commit ac9425c9938cb6202f8cecbcfef3b01a9d908960
Author: Andrew Davis <andrew@moodle.com>
Date:   Sun, 14 Sep 2014 20:49:16 +0800
Tag:    v2.7.3

MDL-47238 core_user: added an error message if guests access user profiles and they aren't allowed to