Git commits in Moodle 3.1.x by Mathew

commit d75d4949efbcb162c1dfa28176acb3c21b82fe56
Author: Mathew <mathewm@hotmail.co.nz>
Date:   Mon, 10 Dec 2018 11:04:10 +0800
Tag:    v3.1.16

MDL-49651 mod_forum: Respect course visibility in cron

commit 344afe028c30206ece6e0c4a68630fe654b7ae53
Author: Mathew May <mathewm@hotmail.co.nz>
Date:   Thu, 15 Dec 2016 11:13:33 +0800
Tag:    v3.1.4

MDL-52098 enrol: cohort now looks at instance status

commit ef6cdec4e57f67a5458ba540a27711ef9bae4516
Author: Mathew May <mathewm@hotmail.co.nz>
Date:   Fri, 04 Nov 2016 09:18:21 +0800
Tag:    v3.1.4

MDL-55362 core: Fixed topic section default name empty h2 tag