Remove unlisted files suggestion

[LordWarlock]

It would be nice if the "Remove unlisted files" feature was changed to something like "Remove superseded updates". The way I think this should work is to add a <superseded_updates> section to the UL file. After activating this option, WUD should only delete files listed in this section. This will prevent accidental deletion of files unrelated to WUD and allow us to store WUD updates together with manually downloaded updates, that are not listed in the UL file (or even Windows Update site, there are quite a few of those - ~30 for XP and 12 for WMP11) and still automatically keep the list free of superseded updates.