fix a bug in dirstate.changes when cwd != repo.root
- use lstat instead of stat
- add a testcase (thanks to Johannes Hofmann)
# 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