Author: Luke Tucker
MDL-46567 gradereport_history: Move paging implementation to db layer
Part of MDL-46191
http://git.moodle.org/gw?p=moodle.git;a=commit;h=d94d6e829aca37d28b63ea5d951dfa61eeea2999
http://github.com/moodle/moodle/commit/d94d6e829aca37d28b63ea5d951dfa61eeea2999
+ 2.8 en [historyperpage,gradereport_history]
+ 2.8 en [historyperpage_help,gradereport_history]