(rmail-message-regexp-p): Handle messages

(rmail-message-regexp-p): Handle messages
whose headers have not been reformatted.
(rmail-message-recipients-p): Likewise.

(rmail-movemail-program): Customized.
(rmail-message-filter): Customized.
(rmail-display-summary): Customized.
(rmail-inbox-list, rmail-keywords, rmail-current-message)
(rmail-total-messages, rmail-message-vector, rmail-deleted-vector)
(rmail-msgref-vector, rmail-overlay-list, rmail-view-buffer)
(rmail-last-label, rmail-last-regexp): Now permanent locals.
(rmail-perm-variables): Set up all permanent locals here.
(rmail-variables): Not here.
(rmail-variables): Set enable-local-variables here.
(rmail-mode-2): Not here.