Add a field to the form for adding courses

**[Original report](https://bitbucket.org/laborstudents/cas-flask/issue/350) by Katelyn Adams (Bitbucket: [paesh1997](https://bitbucket.org/paesh1997), GitHub: [paesh1997](https://github.com/paesh1997)).**

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Scott Steele and Matt Saderholm would like to add a field to the form for adding courses. They’d like to track “Faculty Teaching Credit” in addition to “Course Credit” \(which is the number we capture now: 0.25, 0.5, 1.0, etc\). FTC numbers can be: 0.25, 0.5, 1.0, 1.5 only, so a dropdown makes sense. We’ll need a new DB column as well, and update all UIs that display a course to include this number \(review, edit, approve, etc\).

As well as special topics and cross-listed handling.

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