Moving conffiles between packages, redux

I spent far too much of today cleaning up an upgrade bug to do with conffiles, which I suspect also affects other packages that have attempted to work around dpkg conffile prompts when moving conffiles between packages. If you maintain such a package, please review your code to make sure that it works properly when upgrading both with sarge’s dpkg and with etch’s dpkg. See my debian-devel post

for a full description.