More work on Buscador

Since the last update Buscador has had its utf-8 From: names fixed, gained the ability to undesrtand month names and short years, added Mail::Thread::Arc style threads, begun to grok html mails and attachments better, become much more XHTML compliant (thanks to Brain 'LTJake' Cassidy), will now give a list of all entities on the system and generally become a bit more (in)sane due to exposure to The Real World.