Add test for the redirection of /admin/cache
Add a context to test w/ regular OpenID user
Let's not crash if there is no g.fas_user but a g.auth
Test uploading a file under a regular OpenID user
Update DB model

The unique constraint is for a certain file in a certain election

In other words the user is not allowed to submit twice the same artwork but their can
be multiple artwork with the same title.
Since only election - filename are unique, we do not need to check the title
Adjust the internal API so that it checks the filename rather than the election/filename/title combination
Adjust the unit-tests to the new output generated
Fix unit-test for the change in ordering we set in place