Git commits in Moodle 3.1.18 by Michael Hawkins

commit 7ea1b25cac963f6727d8e89f2d678f47308b43cb
Author: Michael Hawkins <michaelh@moodle.com>
Date:   Mon, 18 Mar 2019 15:23:59 +0800
Tag:    v3.1.18

MDL-61738 messageinbound: Fix quota checks & filesize for email uploads