Fix folder names for alpha/beta source?

WWW,

Can we rename the folders for the alpha source code to be consistent?
Or maybe remove them entirely, now that we're in beta?

I've had some complaints from users that they can't find the beta,
because the alphas are at the top of the list and the beta is at the bottom.

--                                  -- Josh Berkus                                    PostgreSQL Experts Inc.
                        http://www.pgexperts.com