Author: Andrew Hancox
MDL-49963 core: Select all button on participant list works across pages
http://git.moodle.org/gw?p=moodle.git;a=commit;h=5b7c500a71855dde4307be7c5367bad74c703008
http://github.com/moodle/moodle/commit/5b7c500a71855dde4307be7c5367bad74c703008
+ 3.1 en [selectallusersonpage,core]
+ 3.1 en [selectalluserswithcount,core]