MDL-44573: Remove HTML tags in outputs column in offline grading worksheet
MDL-43839 core: changed the default theme from standard to clean
MDL-44535 quiz_statistics : response analysis - limit tries counted
MDL-44075 quiz_statistics : Various coding style / phpdocs fixes
MDL-41284 stop using log table for login weekly and monthly stats

We already have stats for each day, the SUM is what we want there...
MDL-41284 hack stats to use new log readers if available
MDL-44106 add WS_SERVER constant to all web service calls

This will help us hack around some nasty webservice problems,
such as require_login() and it will be used to set proper 'ws' origin
in logged events.
MDL-44106 add origin info to $PAGE object and use it in logs
MDL-44107 deprecated event_base::can_view()

The problem is that it would be too expensive and difficult
to implement reliable access control in each event.
MDL-44107 deprecate can_view() in feedback events, to be replaced by is_anonymous()

See MDL-44661 for more info.
MDL-44368 use $cm->uservisible in activity names filter

This allows proper linking of groupmembersonly and conditional activities.
MDL-44510 support PHPUnit 4.x

The old style PEAR installation is incompatible with PHPUnit 4,
nobody was supposed to use PEAR any more - composer
is the only supported library installation method now.
MDL-44511 import latest jQuery and add tests
MDL-44639 fix some phpdocs issues in tasks classes

There is also one extra () to improve code readability.
MDL-44639 fix phpdocs in scheduled tasks tool
MDL-44661 implement event->anonymous property
MDL-37148 pix: make default user images smaller
MDL-44682 fix bug in decompose_update_into_safe_changes
MDL-44704 core_message: always use system context when triggering a message_sent event
MDL-43784 theme: Removing all the old themes