Author: Andrew Nicols
MDL-36754 core_files: Add a token version of pluginfile
http://git.moodle.org/gw?p=moodle.git;a=commit;h=4a74ab0200d472f600d238787ebbc5e782b2135d
http://github.com/moodle/moodle/commit/4a74ab0200d472f600d238787ebbc5e782b2135d
+ 3.6 en [privacy:metadata:core_userkey,core_files]