Author: Brendan Heywood
MDL-51603 tablelib: Delegate to dataformat for downloading
http://git.moodle.org/gw?p=moodle.git;a=commit;h=bdb80f6a5fd505af6885a0fc820890737f7ce655
http://github.com/moodle/moodle/commit/bdb80f6a5fd505af6885a0fc820890737f7ce655
+ 3.1 en [downloadas,core_table]