Author: David Mudrák
MDL-67752 course: Provide the active user stats during the registration
These new stats provide better insight as they only consider recently
active users and active enrolments only.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=4e907e7be4e94df768409e895aa11e7c27a4aad0
http://github.com/moodle/moodle/commit/4e907e7be4e94df768409e895aa11e7c27a4aad0
+ 3.9 en [activeparticipantnumberaverage,core_hub]
+ 3.9 en [activeusersnumber,core_hub]