Allow admin to submit for any user.

[layus]

This is linked to #28.

It may be useful (but also potentially dangerous) to allow admins to submit as if they were any account. This would allow late submissions, and some flexibility.

This may not be a good idea. You may prefer implementing #30 .

[anthonygego]

This could be investigated, but the student has to be informed it was submitted by an administrator.