+ o halle doesn't deal with melanie'd packages, partial replacements
+ etc. and more.
+
+ o lauren, the tramp, blindly deletes with no check that the delete
+ failed which it might well given we only look for package/version,
+ not package/version _in p-u_. duh.
+
+ o melanie should remove obsolete changes when removing from p-u, or
+ at least warn. or halle should handle it.
+