Author: Frederic Massart
MDL-46570 gradereport_history: Convert to moodle dialogue
Part of MDL-46191
http://git.moodle.org/gw?p=moodle.git;a=commit;h=49bcd2dfae686b451e417ce25d80842949a18d0e
http://github.com/moodle/moodle/commit/49bcd2dfae686b451e417ce25d80842949a18d0e
+ 2.8 en [selectusers,gradereport_history]