Author: Eloy Lafuente (stronk7)
MDL-29248 backup: take rid of the setting and code handling the 'private' user filearea
http://git.moodle.org/gw?p=moodle.git;a=commit;h=4fda074e695f667f4800b25f2d6534d77fcff28e
http://github.com/moodle/moodle/commit/4fda074e695f667f4800b25f2d6534d77fcff28e
- 2.1 en [rootsettinguserfiles,core_backup]