Author: Paul Holden
MDL-75352 comment: implement comments datasource for custom reporting.
Create entity definition for a comment, join with user entity in new
report source to provide data for reportbuilder editor.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=fdf2f8f31b7fbd42e8ec057593afc579063dd3e7
http://github.com/moodle/moodle/commit/fdf2f8f31b7fbd42e8ec057593afc579063dd3e7
+ 4.1 en [comment,core_comment]
+ 4.1 en [comments,core_comment]
+ 4.1 en [pluginarea,core]
+ 4.1 en [pluginitemid,core]