Unattended-Upgrades patch for Remove-unused-dependencies backported to Trusty, Precise

As of today my contribution to unattended-upgrades has been backported into Ubuntu Trusty Tahr and Ubuntu Precise Pangolin, which are both LTS version currently in use. I’m probably more proud of myself than I should be but it was a great feeling to be of help to a global community and prevent further issues with automatic updates making systems unusable.

I will be removing the manually patched packages at the ICG soon and look forward to not maintaining a fork of the software for internal use as that tended to eat up valuable time from other projects.