Author: Shamim Rezaie
MDL-75423 gradereport_singleview: Move show all grades into a menu
http://git.moodle.org/gw?p=moodle.git;a=commit;h=809781c0cc699477879610f11bc984c79f63987a
http://github.com/moodle/moodle/commit/809781c0cc699477879610f11bc984c79f63987a
+ 4.1 en [showallgrades,core_grades]