Author: Shamim Rezaie
MDL-63390 quiz_statistics: Make the summary row more distinguishable
http://git.moodle.org/gw?p=moodle.git;a=commit;h=422d78648cc29b91ef04b591f77a597cc787937f
http://github.com/moodle/moodle/commit/422d78648cc29b91ef04b591f77a597cc787937f
+ 3.6 en [rangeofvalues,quiz_statistics]
+ 3.6 en [viewanalysis,quiz_statistics]