(rmail-get-new-mail-1): Fix the spam beep test.

(rmail-get-new-mail-1): Fix the spam beep test.
(rmail-get-new-mail-filter-spam): Simplify.  Don't mess with
rmail-deleted-vector.
(rmail-insert-inbox-text, rmail-collect-deleted)
(rmail-set-message-deleted-p, rmail-only-expunge)
(rmail-make-in-reply-to-field): Replace ?\  with ?\s.
(rmail-get-labels): Remove unused local `blurb'.
(rmail-message-attr-p, rmail-message-unseen-p, rmail-message-labels-p)
(rmail-msgend, rmail-msgbeg, rmail-message-deleted-p)
(rmail-set-message-deleted-p): Doc fixes.