GeezerVison

I've checked in the essential parts of the warnings PEP, and closed
the SF patch.  I haven't checked in the examples in the patch -- it's
too early for that.  But I figured that it's easier to revise the code
once it's checked in.  I'm pretty confident that it works as
advertised.

Still missing is documentation: the warnings module, the new API
functions, and the new command line option should all be documented.
I'll work on that over the holidays.

I consider the PEP done.

--Guido van Rossum (home page: http://www.python.org/~guido/)