Docs wiki upgrade testing

Testing checklist

1. Log in and log out
2. Edit a page and check that the edit appears in the page history and recent changes
3. Create a new page and check that it appears in the recent changes
4. Ensure email notification of watched pages is enabled, watch a page, log in as a different user and edit the watched page then check that an email is received
5. Delete a page and check that it is shown in the deletion log
6. Upload a file and check that it is shown in my contributions and in the upload log
7. Edit my preferences and check that changes are saved
8. Check a page diff and try rolling back an edit