Allow sorting through, and archiving, Pending Items

Pending Items gets progressively longer as people start forms from our public URLs or get sent packets but don't finish them. It takes forever to load Pending Items from just a week ago. It would be nice to sort through Pending Items for only certain packets/forms, or only Public vs sent ones, autosent vs manually sent, or by date... then it would be nice to archive ones easily to remove them from the homepage.