Git merges in Moodle 3.5.5 by Jake Dallimore

commit b8360b3cfb186bce5579d88955158f10294cd5f9
Author: Jake Dallimore <jake@moodle.com>
Date:   Wed, 23 Jan 2019 09:21:36 +0800
Tag:    v3.5.5

Merge branch 'MDL-52132-35' of git://github.com/rezaies/moodle into MOODLE_35_STABLE

commit 284b7c820ea7c96c2431963bd901ae809310c7d5
Author: Jake Dallimore <jake@moodle.com>
Date:   Mon, 21 Jan 2019 15:59:10 +0800
Tag:    v3.5.5

Merge branch 'MDL-28445-35' of git://github.com/peterRd/moodle into MOODLE_35_STABLE

commit 247b70b0dec7533e30bd8f177fc2797bf92e55a6
Author: Jake Dallimore <jake@moodle.com>
Date:   Mon, 21 Jan 2019 08:59:13 +0800
Tag:    v3.5.5

Merge branch 'MDL-60972-35_delete_section_files' of https://github.com/awagner/moodle into MOODLE_35_STABLE