* nnimap.el (nnimap-group-overview-filename): Create directory for
newfile (when use long filenames is nil). Copy+delete file if
rename didn't work.
(nnimap-group-overview-filename): `rename-file' and `copy-file'
doesn't return anything useful, use ignore-errors instead.
(nnimap-verify-uidvalidity): Delete overview file when
uid validity changes.
(nnimap-group-overview-filename): Store uidvalidity in filenames.
Rename old files into new format.
(nnimap-request-accept-article): Remove \n's from
From_ lines.
(nnimap-request-accept-article): Remove From[^:] lines.
(imap-starttls-p): Check for starttls binary.
(imap-starttls-open): More verbose.
(imap-gssapi-auth): Ditto.
(imap-kerberos4-auth): Ditto.
(imap-cram-md5-auth): Ditto.
(imap-login-auth): Ditto.
(imap-anonymous-auth): Ditto.
(imap-digest-md5-auth): Ditto.
(imap-open): Ditto.
(imap-digest-md5-p): Check capability first.
(imap-parse-flag-list): Correctly parse empty lists.
(imap-login-p): Support LOGINDISABLED.
(imap-parse-body): Work around bug in Sun SIMS.
