MDL-20365 auth_db: Add salted crypt() password hash option
MDL-48180 mod_assign: By default do not count 'new' submissions
MDL-47601 core_backup: ensure removal of automated backups
MDL-48246 theme: Fixed typo in 'hidepanelicon'
MDL-48259 questionlib.php: remove functions deprecated in Moodle 2.1
MDL-48259 questionlib.php: remove functions deprecated in Moodle 2.6
MDL-38343 cache: better test server strings
MDL-48265 feedback: Added alt text to ghostscript test image
MDL-48252 scheduled tasks: file_temp_cleanup_task does full delete.

This scheduled task was previously only doing a partial delete
due to the fact that the directory modification time would be
updated when a child file was deleted. It would then have to
wait another week before that directory could be deleted.
MDL-45867 atto_equation: Change preview update to asynchronous
MDL-23839 navigation: Check for assignable course category roles
MDL-48197 testing: Always set up a mail sink for mail redirection

Rather than setting noemailever in the bootstrap, this sets up a default
phpmailer message sink which will catch all messages.

Tests which require the phpmailer sink will continue to work as before
without change, though the noemailever config setting no longer needs to
be altered.

For tests wanting to test with noemailever set with the previous behaviour,
they will need to load the message sink and then close it.
MDL-48197 testing: Normalise uses of noemailever and phpmailer sink
MDL-22043 mod_forum: Fix toggle subscription editing button behaviour

Update the user session property before generating the button which relies
upon it.
MDL-48274 mod_forum: Add missing context to has_capability call
MDL-9443 core_files: Also filter .xhtml resources.

Change the filters to treat .xhtml files the same as .html,
so they are filtered by both "All files" and "HTML files only".
MDL-47832 cache: removed data source aggregate functionality

Cache data source aggregate functionality was found to be broken
and unused, because of this the decision was made to remove it
rather than fix it.
As it was broken we did not follow typical deprecation methods and
instead the code was removed outright with only structure
remaining and left deprecated.
MDL-48252 scheduled tasks: Unit test for file_temp_cleanup_task.
MDL-48304 moodle_url: compare now considers anchor
MDL-48282 Standardise update of user->firstaccess