Author: sam marshall
MDL-31957 Course reset: Does not erase activity completion data
http://git.moodle.org/gw?p=moodle.git;a=commit;h=eaead2aea85c90a18e4977101f06a673b3d4929c
http://github.com/moodle/moodle/commit/eaead2aea85c90a18e4977101f06a673b3d4929c
+ 2.2 en [deletecompletiondata,core_completion]