Git commits in Moodle 3.6.2 by Ilya Tregubov

commit 3b9f40920a7a73d8ae72c8d63c0363f8133382a4
Author: Ilya Tregubov <ilyatregubov@catalyst-au.net>
Date:   Thu, 06 Dec 2018 09:35:47 +0800
Tag:    v3.6.2

MDL-63710 repository: Delete orphaned file records.