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Before I lose track of the updated patches I made.. They can
be found here:

http://scottdial.com/python-dev/ConfigParser.diff
http://scottdial.com/python-dev/test_cfgparser.diff

The notes I emailed Tony were:

* I have modified the OPTCRE matching to not just throw away
the whitespace after a [=:]. Second, I have modified the
opt.rstrip(), again so that the whitespace isn't just thrown
away. A new variable padded_vi then appears which is a
formatting-preserved version of vi.

* I have removed at least one erroneous write('\n'), and
changed the pattern for adding newlines to missing sections,
such that the newlines are added /before/ the section
heading (and only if there are lines appearing before).
These together solve the growing blank lines phenomena.

* I have modified the add_missing section to deal with
DEFAULTSECT appropriately. Which solves the
appearing/disappearing act that I had mentioned.

* I have updated the test's to match the new expected output. 

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And in reponse to Jim's comment, such a feature is not in
the scope of the patch. The patch is to explicitly leave
things the way they are, so any sort of sorting would make
no sense.