Don't forget version at the end of setup.py, write it only if changed.
This fixes issue159: "python setup.py install" shouldn't write new files
in the working dir if one has done "python setup.py build" first.
# repo.py - repository base classes for mercurial
#
# Copyright 2005 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.
class RepoError(Exception): pass