[tei-council] directory layout again

[Syd Bauman]

While I don't like explaining what the "P" stands for either, I am
going to have to sit down and study this for awhile to figure out how
it fits into the Debian guidelines before I decide whether I think
it's a good idea or not. Which I hope to try to do before the
conference call, but it's going to be tough.

And I really *hate* the name "teiclassic". If we do end up with this
high-level versioning, let's make it tei4/ and tei5/, eh?