Debian fixes

Hi.

Here are some small improvements to the Debian packaging of mongodb, but there are still a lot of issues that need to be fixed.

Some of those are trivial, while others are a matter of taste: do you insist in using cdbs for the package? What about a plain, vanilla (but modern) dh-based debian/rules?

Anyway, we are now embedding fewer libraries, which makes me happier. :)

Oh, thanks for pushing the changes to a public repository. Otherwise, there would be no patches. :)