Git commits in Moodle 3.7.0 by Olivier Piton

commit 85e81896fc66821ce30015fe380997894763e484
Author: Olivier Piton <olivier@cblue.be>
Date:   Thu, 13 Dec 2018 12:02:23 +0800
Tag:    v3.7.0-beta

MDL-61535 report_security: SQL Perf improvement