New draft for the flow-shop chapter.

Latest changes according to feedback from @mdibernardo and a completed chapter draft.
I'm torn about what to suggest for a couple of the prose sections where you discuss emitting results. On one hand, if emitting the output is trivial, would it be better to cut it? On the other hand, it does provide a bit of closure or finality to bookend the section. I'm not sure I can suggest one way or the other, but it's something that I thought of while reading through, so if you end up needing to cut something to make length, it might be useful.