Git commits in Moodle 3.2.6 by Davo Smith

commit c69f39676920a0aece6f74f43f2f717c6f092655
Author: Davo Smith <davo.smith@synergy-learning.com>
Date:   Fri, 06 Oct 2017 19:46:05 +0800
Tag:    v3.2.6

MDL-60366 mod_feedback: fix deletion of valid anonymous duplicates