Author: jerome mouneyrac
community block MDL-24306 add sort by rating
http://git.moodle.org/gw?p=moodle.git;a=commit;h=7a0d0804c128d41c91a9be9bb18bed36966b7d2a
http://github.com/moodle/moodle/commit/7a0d0804c128d41c91a9be9bb18bed36966b7d2a
+ 2.0 en [orderbyratingaverage,block_community]