Update years in debian/copyright.
Update debian/rules:
configure with -DCHECK_GTK_DEPRECATED=OFF instead of
-DCHECK_GTK_DEPRECATED=ON to fix FTBFS with Gtk+ >= 2.24.18
Update debian/control: add build dependency from libboost-system-dev
(Fixes FTBFS on Ubuntu Saucy due to Boost transition 1.49 --> 1.53)
Update debian/changelog.