Cleared out and streamlined parts of chapters 13- 18 or s...

Cleared out and streamlined parts of chapters 13- 18 or so, and knitted the beginning of this section (13-whatever) into what looks like a working draft. It's going to be a real b*tch to unknit it if I need to, but it's also a good strong foundation to keep me moving forward without confusion, so I'll just keep moving on and hope I don't have to unknit it.