[WIP] Update Debian files for release 3.5.

I opened this PR to finish up the debian mods for release 3.5, which I would like to get out asap.

This reflects the conversation in issue #275 as I understand it. I turned on the example building and didn't add the diff that unlisted the example binaries installation directory, which I believe is /usr/lib/*/simbody/*. But I'm fuzzy about this; I just wanted to start a PR where we can finish it.

@j-rivero, @chrisdembia you both can push directly to this PR's branch, please do!