Developer credits
Git commits in Moodle 2.5.6 by Mark Nelson
commit 9941015719002dc4579d1a7d118ce8190644fdc0 Author: Mark Nelson <markn@moodle.com> Date: Wed, 09 Apr 2014 15:00:25 +0800 Tag: v2.5.6 MDL-42462 mod_feedback: added $OUTPUT to list of global variables used to avoid error