Before MDL-59854 it was possible to have duplicate forum subscriptions.
Trying to import backups created from back then, caused a DB exception
due to unqiue key constraints. Now only one of multiple identical forum
subscritions is restored.
It was decided to roll only configuration dates and any date related to user content
such as 'timecreated' , 'timemodified' etc should not be rolled forward.
This patch adds support for time-based locking of discussions.
Discussions are automatically locked after a user-definable period of
inactivity. After this time, only those with the the relevant capability
are able to add replies.
This has been designed to add support for other types of discussion locking
at a later date with relative ease.
* Added the component and ratingarea fields and implemented it throughout
the rating API as mandatory fields
* Cleanup rating indexes
* Upgrade forum/data/glossary ratings
* Moved the logic in the render_rating method to methods of the rating object.
* Added new callback for checking ratingareas
* Cleaned comments here and there
* Mark the xxx_get_participants methods as deprecated
* Refactor rate_ajax and ratingsuser_can_view_aggregate methods
* Cleaned up rating/index.php to use html_table object and moved inline styles to CSS.
* Added missing properties of the rating object that were being set throughout the rating
API.
