Merge changes made in Gnus trunk.

Merge changes made in Gnus trunk.

nnimap.el (nnimap-open-connection): Only send AUTHENTICATE PLAIN if LOGINDISABLED is set.
gnus.el (gnus-group-startup-message): Move point to the start of the buffer.
nndoc.el (nndoc-dissect-buffer): Reverse the order of the articles to reflect the order they're in in the digest.
gnus-sum.el (gnus-summary-select-article): Make `C-d' work reliably by checking whether the original article buffer is alive.
shr.el (shr-find-fill-point): Don't break lines between punctuation and non-punctuation (like after the apostrophe in "'We").
gnus-cite.el (gnus-article-fill-cited-article): Remove unused `force' parameter.
gnus-art.el (gnus-treatment-function-alist): Have gnus-treat-fill-long-lines point to gnus-article-fill-cited-long-lines.
gnus-art.el (gnus-treat-fill-long-lines): Change default to fill all text/plain sections.
gnus.el: Autoload gnus-article-fill-cited-long-lines.
gnus-art.el (gnus-mime-display-alternative): Actually pass the type on to `gnus-treat-article'.
gnus-sum.el (gnus-summary-show-article): Add `C-u C-u g' for showing the raw article, and change `C-u g' to show the article without doing treatments.
gnus.texi (Paging the Article): Document C-u g/C-u C-u g.
gnus-cite.el (gnus-article-foldable-buffer): Refactor out.
gnus-cite.el (gnus-article-foldable-buffer): Don't fold regions that have a ragged left edge.
gnus-cite.el (gnus-article-foldable-buffer): Skip past the prefix when determining raggedness.
gnus-srvr.el, nnir.el: Allow nnir searching for an entire server.
gnus-msg.el (gnus-configure-posting-styles): Permit the use of regular expression match and replace in posting styles.
gnus-art.el (gnus-treat-article): Only inhibit body washing, and leave the header washing to take place.
nnimap.el (nnimap-request-accept-article): Erase buffer before appending for easier debugging.
nnimap.el (nnimap-wait-for-connection): Take a regexp.
nnimap.el (nnimap-request-accept-article): Wait for the continuation line before sending anything unless we're streaming.