Git commits in Moodle 3.7.0 by Paul Damiani

commit 9ffbb786686a046730a8c7047f14ef63f5e450bf
Author: Paul Damiani <pdamiani1996@gmail.com>
Date:   Thu, 10 Jan 2019 14:18:00 +0800
Tag:    v3.7.0-beta

MDL-63569 email: New setting to prefix the subject of outgoing emails