Bug#4221: knews silently overwrites configuration file

[Nils Rennebarth <nils@nus.de>]

Knews should handle an upgrade more intelligently and not simply overwrite
the (possibly customized) /usr/X11R6/lib/X11/app-defaults/Knews
configuration file.

I know this is difficult to do right. A lot of Knews functionality depends
on a working Knews.ad and what is necessary there changes from release to
release. 
Maybe it should look if there already exists one and give the user an
option to install a new one / back up the old one ... like dpkg does.

Listing it as a conffile is not satisfactory though because it is created
from user-input at installtime.

--
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