Git merges in Moodle 3.6.3 by Jake Dallimore

commit b92327307af63ccee61fe84a515600ae24eb50ba
Author: Jake Dallimore <jake@moodle.com>
Date:   Wed, 23 Jan 2019 09:21:17 +0800
Tag:    v3.6.3

Merge branch 'MDL-52132-36' of git://github.com/rezaies/moodle into MOODLE_36_STABLE

commit 3741df64feeab5d05171e36101d5c880898271a4
Author: Jake Dallimore <jake@moodle.com>
Date:   Mon, 21 Jan 2019 15:58:50 +0800
Tag:    v3.6.3

Merge branch 'MDL-28445-36' of git://github.com/peterRd/moodle into MOODLE_36_STABLE

commit cbd56f15374b02ff588ea62c3bd5f9bb5f8ad09e
Author: Jake Dallimore <jake@moodle.com>
Date:   Mon, 21 Jan 2019 08:58:36 +0800
Tag:    v3.6.3

Merge branch 'MDL-60972-36_delete_section_files' of https://github.com/awagner/moodle into MOODLE_36_STABLE