Author: Marina Glancy
MDL-55333 mod_feedback: work around MySQL tables in join limit
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e96c826c3dbb2e360c182662c865539338afa4b9
http://github.com/moodle/moodle/commit/e96c826c3dbb2e360c182662c865539338afa4b9
+ 3.2 en [questionslimited,mod_feedback]