See SPEC.md for more info.
Also considered adding an explanation to DESIGN.md, but there's not a
great place for it. Maybe FCRCs are too low-level for the high-level
design document. Though may be worth reconsidering if DESIGN.md gets
revisited.
Now with graphs! Images are stored on the branch gh-images in an effort
to avoid binary bloat in the git history.
Also spruced up SPEC.md and README.md and ran a spellechecker over the
documentation. Favorite typo so far was dependendent, which is, in fact,
not a word.
