(rmail-message-recipients-p-1): Don't bother

(rmail-message-recipients-p-1): Don't bother
starting from the beginning, since mail-fetch-field does not care.
(rmail-create-summary-line): Fix unseen handling.  (Bug#2089)
(rmail-get-summary-status): New name for old rmail-get-summary-labels.
(rmail-get-summary-labels): New function.  Returns labels rather than
status (edited, etc).
(rmail-create-summary): Insert an extra space after the status
flags, for consistency with old rmail, and with current
rmail-summary-font-lock-keywords.