Author: Jetha Chan
MDL-23912 core_comment: update count after deletion
http://git.moodle.org/gw?p=moodle.git;a=commit;h=71688853e01e1cdf9ca4e5d286eae4f682a8b013
http://github.com/moodle/moodle/commit/71688853e01e1cdf9ca4e5d286eae4f682a8b013
+ 2.9 en [commentscount,core]