Author: Farhan Karmali
MDL-61183 user: Added total participants count on paricipants page
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6afa07edd10c7add8622064db32806e9977d3ba3
http://github.com/moodle/moodle/commit/6afa07edd10c7add8622064db32806e9977d3ba3
+ 3.5 en [participantscount,core]