Bug#40766: Rewrite of "configuration files" section

[Julian Gilbey <J.D.Gilbey@qmw.ac.uk>]

OK, almost there.  But one quickie:

The sentence:
  A package may not modify a conffile of another package.
was replaced by something better, but I'm not sure what the conclusion
was.  How about:
  The maintainer scripts of a package may not modify a conffile of
  _any_ package, including the one the scripts belong to.
as proposed by Hamish.

   Julian

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  Julian Gilbey, Dept of Maths, QMW, Univ. of London. J.D.Gilbey@qmw.ac.uk
        Debian GNU/Linux Developer,  see http://www.debian.org/~jdg