Git commits in Moodle 3.6.4 by Nathan Nguyen

commit 47b4f219949da035ed7eb19620b2b255fb0b3c80
Author: Nathan Nguyen <nathannguyen@catalyst-au.net>
Date:   Fri, 15 Feb 2019 13:20:14 +0800
Tag:    v3.6.4

MDL-63263 tool_recyclebin: Apply automated backup setting