Author: Paul Holden
MDL-75191 task: implement task logs datasource for custom reporting.
Update existing entity to define remaining report elements. Add new
report source joining the entity to the user entity to provide data
for the reportbuilder editor.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=30427e91c2d2879fda709ba14586c24acbed88a9
http://github.com/moodle/moodle/commit/30427e91c2d2879fda709ba14586c24acbed88a9
+ 4.1 en [task_endtime,core_admin]
+ 4.1 en [task_dbreads,core_admin]
+ 4.1 en [task_dbwrites,core_admin]