Unprecise questions in interactive mode

[naapuri]

1. In interactive mode, the client asks whether to upgrade packages. However, the proposed version might be older than the installed one.

Upgrade Package netbase (4.28 -> 4.27)? (y/N)
}}}}

I'm not sure whether we can always have a credible way to check which package is newer, so maybe the best (or at least easiest) fix is to change the text to something like "Upgrade/downgrade Package".

2. With ConfigFile entries, the client asks this question for any kind of anomaly:

{{{
Would you like to install ConfigFile: /etc/hosts? (y/N):
}}}

This question should better indicate what is going to happen if one says "y" here. It might mean installing a whole new file or changing file contents and/or permissions/ownership. (Yes, the client might have printed lines such as "ConfigFile /etc/hosts permissions wrong: are 0640 should be 0644" but they are not necessarily adjacent to the question.) How many different question texts are needed?

[desai]

partial copy of #367