[brisbane-core/MERGE] minor CHKMap clean-ups

[Ian Clatworthy]

I did a partial review of CHKMap.py today trying to
track down a bug (bzr ls -r-1 aren't working yet).
Attached are some tweaks, mostly in comments, but some
code fixes as well.

I hope the code fixes are obvious. The only one that isn't
is the removal of a redundant __repr__ routine - the
superclass has identical code so it's not needed in the
subclass.

Ian C.

PS: If we think this code is now stable enough to come into
bzr.dev, I'll do a more formal review.
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