base: offer the user to run reclaim for him
base: offer the user to run reclaim for him

That's more helpful that just printing a ui_warn. If
macports::ui_options(questions_yesno) is not available or the user answers no,
don't do anything.

git-svn-id: 620571fa9b4bd0cbce9a0cf901e91ef896adbf27@146709 d073be05-634f-4543-b044-5fe20cf6d1d6

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