(nnimap-open-connection): Allow anonymous login.
(nnimap-transform-headers): The chars header is called Chars not
Bytes.
+ (nnimap-wait-for-response): Don't infloop if the IMAP connection
+ drops.
* gnus-art.el (gnus-article-describe-briefly): Fix up typo in last
patch, found by Knut Anders Hatlen.