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Sortorder field in badge_external_backpack was updated with a wrong
value. This patch fixes this behaviour and adds sortorder as
sorting criteria for displaying the list of site backpacks.

In the phpunit method reviewed for covering this, a couple of
assertEquals() calls have been changed too to put the expected value
first.

Peter authored Sep 25, 2019 and Peter Dias committed Oct 26, 2020

* Restructure the email to be backpack specific
* Amended table defintion and functions

Falling back to path within $CFG->dataroot/models.

This upgrade step fixes the cases where the current guest user is
labelled as 'deleted' and the related user context is missing.

The remove_course_contents function did not delete data from
course_module_completion table in most cases, resulting in large
quantities of orphaned data.