Log Message:
Update 2.066->2.082
- another fix for the case of two "Content-Type" lines, hit
  by a recent, now frequently appearing, spam message.
- various IMAP4 improvements by [David Golden]
- stop when message coersion is called but not possible.
- fixtest, to work with MIME::Entity changes.
- field attributes which contained a '\' where considered
  empty.  Reported by [Ricardo Signes]
- Message rebuild with nested message failed.  Fixed by
  [Mat Johns]