copy & rename can ignore removed source files
As mercurial now distinguishes deleted files from removed files,
we can skip removed source files while copying or renaming.
# 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