[MDL-13548] log statistics fixes and improvements - meta - Moodle Tracker

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MDL-28443 Action logging improvements META

1.	activity report gives bogus data and problems in participation report	Closed	Petr Skoda
2.	replace primary role concept in logs with new code from stats	Closed	Petr Skoda
3.	the report selection is slow on large sites - simplify it	Closed	Unassigned
4.	add cmid index to log table to speedup reports that deal with individual activities	Closed	Petr Skoda

Component watchers:: David Woloszyn, Huong Nguyen, Jake Dallimore, Meirza, Michael Hawkins, Raquel Ortega, Safat Shahin, Stevani Andolo, David Woloszyn, Huong Nguyen, Jake Dallimore, Meirza, Michael Hawkins, Raquel Ortega, Safat Shahin, Stevani Andolo