Developer credits
Git commits in Moodle 2.6.6 by Andrew Davis
commit a18b4d11094ef085af76feaf2793bf3c004ef2e0 Author: Andrew Davis <andrew@moodle.com> Date: Sun, 14 Sep 2014 20:49:16 +0800 Tag: v2.6.6 MDL-47238 core_user: added an error message if guests access user profiles and they aren't allowed to