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copies: teach copies about dirstate.copies

When we're using copies() to find changes between the working directory and
its first parent for diff/status/etc., use dirstate.copies() directly.

This avoids doing a full statwalk for simple diffs (issue1090) and
removes a special case from the status command.

Basic install:

 $ make            # see install targets
 $ make install    # do a system-wide install
 $ hg debuginstall # sanity-check setup
 $ hg              # see help

See http://www.selenic.com/mercurial/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.