Git commits in Moodle 3.2.6 by Tobias Reischmann

commit cf266bd3e295b517f37553cf4abfeab153858de0
Author: Tobias Reischmann <tobias.reischmann@wi.uni-muenster.de>
Date:   Thu, 17 Aug 2017 23:01:22 +0800
Tag:    v3.2.6

MDL-59854 forum: Created unique db key for forum_subscriptions