Show period types

[Bad-Science]

We are not currently displaying the types of periods. We should display these in schedule view, and in the section view if possible. How we choose to show them is up for discussion. The easiest option for showing them in the section view is a tooltip. On the schedule view we could use a tooltip or just show them inline. Or something totally different!

cc @sydtaylo @bmcutler

[marchdan]

Any specific input on UI design on this?