Ability to hide/delete spam feedbacks in admin view

[pmk01]

It would be useful if in Admin I could, manually mark/unmark comments as Spam, and maybe delete comments? A search/filter function would also be neat. At present all you can do is sort on spam, which goes some way to filtering it, but plenty of spam comments remain unmarked as such. At present I can't manually tag comments at all.

This is useful for looking at comments in real-time.