Part of MDL-58220

Edit the DB files with XMLDB to detect/fix errors.

Part of MDL-58220

Instead provide buttons to quickly create pre-configured
versions of any of the known OAuth 2 services.

Part of MDL-58220

Request an oauth client with an access token retrieved with the stored refresh token from the OAuth issuer.

Part of MDL-58220

Add defaults for facebook authentication and drop behaviour field completely.

Part of MDL-58220

OAuth services working fully from config - no more subclasses for each OAuth issuer.

Part of MDL-58220

Allow the behaviour of each oauth service to be customised by config instead of
subclasses.

Part of MDL-58220

Build an admin page where OAuth 2 services can be installed and configured.

Part of MDL-58220

Long history resumed: The test relies on the first group
being the first that is created, the first group is
actually the first one ordering by name. If  is
group-999 and  is group-1000  is returned
as the first group.

It was using the pre-integration version where a group was mandatory

The constant LESSON_PAGE_BRANCHTABLE requires the page type file.

This is and edge case created by a bug in the numeric question type.