Ability to remove a package along with its unused dependencies with synaptic.

Synaptic should provide the ability to mark a package along with its unused (by other programs) dependencies for removal. This way, a user can manually clean up the system, where automatic tools are inadequate (like deborphan and apt-get autoremove). This is especially useful when dealing with the large amount of GUI frontends for command line applications, for which the installation is very easy (with automatic dependency checking), but removal acts only on the GUI package and leaves the CL application and libs in place and usually unused.