Always do the motion in the rmail buffer; let that handle summary.
(rmail-undelete-previous-message): Likewise.
(rmail-select-summary): New macro.
(rmail-show-message): Use rmail-select-summary.
(rmail-get-new-mail): Likewise.
(rmail-expunge): Likewise.
(rmail-bury): Record Rmail buffer to bury it later.
Major changes from Bob Weiner <weiner@pts.mot.com>
Handle some Emacs 18 function names to run in 18.
This is to facilitate working with Weiner.
(rmail-reply-prefix): New variable.
(rmail-reply): Use that variable to add to subject.
(rmail-retry-failure): Change binding to M-m.
(rmail-forward): Look for >From as well as for From.
Handle case where neither is found.
(rmail-last-regexp): New variable.
(rmail-mode): Make rmail-last-regexp local.
(rmail): Don't update rmail-mode data for old buffer
if it's not in rmail mode.
Error if in Rmail Edit mode.
(rmail-bury): New command, plus key binding.
(rmail-summary-by-topic): New key binding.
(rmail-insert-inbox-text): Check for pop case earlier.
(rmail-convert-to-babyl-format): Handle Content-Length field.
(rmail-maybe-display-summary): New function.
(rmail-redisplay-summary): New user option.
(rmail-undelete-previous-message, rmail-delete-forward):
(rmail-get-new-mail, rmail-show-message): Update summary buffer if any.
Call rmail-maybe-display-summary to put it back on screen.
(rmail-only-expunge): Renamed from rmail-expunge.
(rmail-expunge): New function.
(rmail-message-recipients-p, rmail-message-regexp-p): New functions.
(rmail-summary-exists, rmail-summary-displayed): New functions.
just return its number, if there was an unseen message.
(rmail): Check for unseen messages before calling
rmail-get-new-mail. After getting the new mail, call
rmail-show-message to show the pre-existing unseen message, or if
that is nil, the current message, which rmail-get-new-mail sets to
the first new message.
