- Adds upgrade --universe and upgrade --universe --clean. It will
attempt to bring the system as much close as the content available in
the repositories. It differs from a standard upgrade which checks
directly that what is pulled in doesn't conflict with the system. In
this new way, we just query the SAT solver to decide that on our
behalf.
- Add uninstall --full-clean. It uses only the SAT solver to uninstall
the package and it will drop as many packages as required (including
revdeps of packages too.
