Always show students the initial status screen

[Jeremy Hopkins]

Could students always be shown the initial status screen even when they have not made a submission. Currently, when a student comes to make a submission they are taken straight to the Peer Assessment rating screen where they are asked to complete the scoring.

It would be better if students always saw the initial screen with the deadline and other details, and then saw either an:

1. Add submission button if they have not already submitted (new)
2. Edit submission button if they have submitted (this is already in place)

So, a student who has not submitted yet would see the same status screen with an “add submission” button:

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[Frédéric Massart]

Always display overview screen to students. Fixes #35

→ <<cset 4f5eb510cd3a>>