Upgrade to Lpeg 1.0

[daurnimator]

Currently Lpeg 0.12 is emulated.
1.0 has been released (mostly bug fixes)

[pygy]

Yup, I've seen your call about it on the ML/in my mailbox too :-)

Actually, LuLPeg already supports arbitrary Lua values as group names. Not doing so would have required more code, and I didn't know it wasn't supposed to do it.

I'll look into the latest release for the misc changes.