Author: Ilya Tregubov
MDL-75423 gradereport_singleview: Next/previous user/item links
Added navigation links similar to user report page.
Removed top paging bar. Bottom paging bar and select per page
are moved on same level with next/previous links.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6ae4e00d7268ce9145395106db9d08d7e5ade9cb
http://github.com/moodle/moodle/commit/6ae4e00d7268ce9145395106db9d08d7e5ade9cb
+ 4.1 en [gotonextreport,gradereport_singleview]
+ 4.1 en [gotopreviousreport,gradereport_singleview]