Author: Paul Holden
MDL-80063 roles: implement roles datasource for custom reporting.
Comprised of existing context, role & user entities to provide all
report data.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=54a51e838206c228b6021e349a55065b6f783297
http://github.com/moodle/moodle/commit/54a51e838206c228b6021e349a55065b6f783297
+ 4.4 en [roleassignment,core_role]
+ 4.4 en [roleoriginalname,core_role]