Author: Mark Nelson
MDL-40908 core_tag: replaced 'flag' add_to_log call with an event
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6298494d7377f96ee0986d581907c95d3fa24615
http://github.com/moodle/moodle/commit/6298494d7377f96ee0986d581907c95d3fa24615
+ 2.7 en [eventtagflagged,core_tag]