Author: Amaia Anabitarte
MDL-62920 user: Uploading deleted user and adding to a cohort
http://git.moodle.org/gw?p=moodle.git;a=commit;h=5e4aaa886c2f1403aa442705dcb5ef8da79fe889
http://github.com/moodle/moodle/commit/5e4aaa886c2f1403aa442705dcb5ef8da79fe889
+ 3.6 en [deleteduser,core_bulkusers]