(mail-recover-1): New function.

(mail-recover-1): New function.
(mail-recover): Switch to the *mail* buffer right away.  Use
buffer-auto-save-file-name instead of calling
make-auto-save-file-name.  Call dired-noselect instead of invoking
`ls' directly.  Bind coding-system-for-read to emacs-mule-unix
before reading the auto-save file.  If the buffer's auto-save file
does not exist, call mail-recover-1 to allow recovery from past
auto-saved drafts.