This basically works.  It depends on a local database which we somehow need to determine how to update.

Aside from that, binary files are not currently marked, and empty files cause the diff viewer to blow up.

I can provide some diffs for testing if anyone would so desire.

---

Round two, I think I got everything, although I'm not sure how to handle the FileNotFound, since I'm using file id's which don't contain the name or anything...