Courses names should be links in the requirements text

[Graham42]

This could be data that is pre-parsed, or just use a regex like the original site. The first method would be better.

[mystor]

We might want to pull in some of my old code from ChrisCooper/QcumberD#89. I had a requirements text parser (though it could definitely be improved/maybe should be re-written)

We'd probably preprocess the requirements text during the import phase to inject the references into the text, so that we don't have to do it when serving the page.