Git commits in Moodle 3.4.4 by sam marshall

commit 9d97d1e0069c1156ffd77739e501cf24ed450524
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Tue, 28 Nov 2017 21:21:49 +0800
Tag:    v3.4.4

MDL-60915 Document new dboption in config-dist.php


commit f83d748f7767f1621ed2aebbffe366dacc6eaed5
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Wed, 11 Oct 2017 19:16:12 +0800
Tag:    v3.4.4

MDL-60915 core_dml: fix miscellaneous incorrect recordset usage


commit 838f07703afc5cc04dbde10b3b6c40b39371ceab
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Tue, 10 Oct 2017 22:08:54 +0800
Tag:    v3.4.4

MDL-60915 core_dml: get_recordset on Postgres eats all the RAM