Git commits in Moodle 3.7.0 by Michael Aherne

commit 495b4b412dc77e2e2780010b964ff6628160d6d9
Author: Michael Aherne <michael.aherne@strath.ac.uk>
Date:   Tue, 15 Jan 2019 22:36:19 +0800
Tag:    v3.7.0-beta

MDL-64587 xmldb: XMLDB option to add mandatory persistent fields.

commit 11361acfb589a2bc8a8a7762f6a339e6a1444bd8
Author: Michael Aherne <michael.aherne@strath.ac.uk>
Date:   Tue, 04 Dec 2018 21:01:07 +0800
Tag:    v3.7.0-beta

MDL-64216 privacy: Split query to use indexes.