Author: Mathew May
MDL-77902 gradereport_grader: Clear btn & user differentiation
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ae6826953eda157c849e783cc83814dd7f2d1bad
http://github.com/moodle/moodle/commit/ae6826953eda157c849e783cc83814dd7f2d1bad
+ 4.2 en [clearsearch,gradereport_grader]
+ 4.2 en [viewallresults,gradereport_grader]
- 4.2 en [showingxofy,gradereport_grader]