Git commits in Moodle 3.3.4 by Jake Dallimore

commit 7ec58e84b09dd9076d71d565d1bbdd4277e2c9ba
Author: Jake Dallimore <jake@moodle.com>
Date:   Fri, 08 Dec 2017 11:55:28 +0800
Tag:    v3.3.4

MDL-23887 database: fix use of deprecated system tables for mssql

commit d7a7ef5c44d98c969e622526d80143529d6b5325
Author: Jake Dallimore <jake@moodle.com>
Date:   Wed, 06 Dec 2017 09:07:25 +0800
Tag:    v3.3.4

MDL-60767 admin: fix usage of admin_write_settings

commit b01791c0761cbe2fd88439775e3458d8a68e1d9a
Author: Jake Dallimore <jake@moodle.com>
Date:   Mon, 04 Dec 2017 16:53:51 +0800
Tag:    v3.3.4

MDL-44667 database: fix incorrect usages of $DB->get_field

commit 2a626230eed364e7a8d7edc086a603efe50d2398
Author: Jake Dallimore <jake@moodle.com>
Date:   Thu, 16 Nov 2017 11:13:09 +0800
Tag:    v3.3.4

weekly release 3.3.3+

commit c13b3ca26b8fa025b5978ae51a1db6a417f1a25c
Author: Jake Dallimore <jake@moodle.com>
Date:   Wed, 15 Nov 2017 16:42:18 +0800
Tag:    v3.3.4

MDL-58272 core_files: get converters from file extension not mimetype