Graph Discussion (Temporary)

Since commenting directly on lines in github is easier than anything else I can think of, I'm opening this PR to pass feedback to @mtbc. I've marked it "exclude" and it will likely be closed quite soon. ~Josh.

--exclude
If there's any likely hood of our wanting to have 2 implementations at the same time (in case things break?), I'd go for `Chgrp2` a la `popen`.