Author: Ryan Wyllie
MDL-61135 question: add tag filter condition
http://git.moodle.org/gw?p=moodle.git;a=commit;h=031a275288d524c979d2c792948d08f8c976e1ee
http://github.com/moodle/moodle/commit/031a275288d524c979d2c792948d08f8c976e1ee
+ 3.5 en [filterbytags,core_question]
+ 3.5 en [notagfiltersapplied,core_question]