Add option to email take-home exams
This is likely to be added next to the download pdf options in the email page. The idea is to show a panel similar to the one in the Email tab, we can allow the user to edit the subject and content of the email (possibly using a template) and choose between email everyone or someone in particular. Then, an email will be send with a single unique copy of the take-home exam pdf attached.
It might be important to add a confirmation box before or after the Email
button is clicked, warning the teacher not to send an actual exam to the students.