Bug#40766: Rewrite of "configuration files" section

[Hamish Moffatt <hamish@debian.org>]

4.7.4. Sharing configuration files
----------------------------------

     Only packages that are tagged _conflicting_ with each other may
     specify the same file as `conffile'.

     A package may not modify a conffile of another package.



Perhaps this last line should be changed to indicate that:

* the maintainer scripts should not alter the conffile of ANY package,
  including the one the scripts belong to.

* the program itself in the package may modify the conffiles of other
  packages (eg if the program is an editor or dotfiles-type package).
  It may be better to leave this point out to avoid confusion.

Hamish
-- 
Hamish Moffatt VK3SB (ex-VK3TYD). 
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