Database

Insertion for Courses and Lectures works. There is a bug with Tutorial insertion. I am having great difficulty with performing queries on the database and returning them as responses in Happstack.

We can talk more about this during the meeting.
I have made the change, but I still need to use `T.unpack` if I want to use the `sessionStr` in some sort of (expected) failure message. I'll see what I can do in terms of homogenizing the Text/String types (favouring the use of one over the other when their is a choice between either).