Author: Mark Nelson
MDL-57455 mod_data: added reset tags functionality
http://git.moodle.org/gw?p=moodle.git;a=commit;h=80effa0faa938b8701b6dc86d2288aece127397f
http://github.com/moodle/moodle/commit/80effa0faa938b8701b6dc86d2288aece127397f
+ 3.4 en [removealldatatags,mod_data]
+ 3.4 en [tagsdeleted,mod_data]