best way to announce important changes

[Christoph Wegscheider <wegi@despammed.com>]

Hi,
I maintain the rsnapshot package, which is a perl script for backups.

In the next upstream version there will be changes which WILL break
almost all setups. One has to modify the conf file to avoid that. 

According to the developer reference (6.3.4) such changes should be
mentioned in the News.Debian file. I think that's not enough, because
if one doesn't change the conf file rsnapshot will not fail, but will
do things (most likely) not wanted by the user. Therefor I intend do
show a warning with debconf. 

Are there better solutions?

Thx
	Christoph