Git commits in Moodle 3.6.0 by Ed Basset

commit 1764defb5a1d71691b500faeaae4cebbb1f47b22
Author: Ed Basset <ed.a.bassett@gmail.com>
Date:   Mon, 21 May 2018 18:15:26 +0800
Tag:    v3.6.0-beta

MDL-36424 wiki: set group so subwiki tabs/pages display correctly