Author: Tony Butler
MDL-57602 mod_assign: Add 'Granted extension' filter for grading table
http://git.moodle.org/gw?p=moodle.git;a=commit;h=696bd4d68b3f088fa7a5726d1bde6161fb3bcdbc
http://github.com/moodle/moodle/commit/696bd4d68b3f088fa7a5726d1bde6161fb3bcdbc
+ 3.3 en [filtergrantedextension,mod_assign]