Developer credits
Git commits in Moodle 2.8.0 by Dan Bennett
commit f181e4ac456596b1a361915dac79f4279bd3eaf4 Author: Dan Bennett <dan@howtomoodle.com> Date: Fri, 17 Oct 2014 19:12:39 +0800 Tag: v2.8.0-rc1 MDL-46332 : Display of 'Remove' button in Add/Remove Groups in Grouping