uninstall: allow unforced removal of a port with dependents, iff it is inactive and there is at least one other version of the same port installed.
uninstall: allow unforced removal of a port with dependents, iff it is
inactive and there is at least one other version of the same port installed.

git-svn-id: 620571fa9b4bd0cbce9a0cf901e91ef896adbf27@36747 d073be05-634f-4543-b044-5fe20cf6d1d6

macports/macports-base,neverpanic/macports-base,danchr/macports-base,macports/macports-base,danchr/macports-base,neverpanic/macports-base