Author: sam marshall
MDL-31957 Course reset: Does not erase activity completion data
http://git.moodle.org/gw?p=moodle.git;a=commit;h=40f6697f2e78efc639b444b9959e71390d73ed9f
http://github.com/moodle/moodle/commit/40f6697f2e78efc639b444b9959e71390d73ed9f
+ 2.3 en [deletecompletiondata,core_completion]