Merge changes made in Gnus trunk.

Merge changes made in Gnus trunk.

nnir.el: Batch header retrieval.
proto-stream.el: New library to provide protocol-specific TLS/STARTTLS connections for IMAP, NNTP, SMTP, POP3 and similar protocols.
nnimap.el (nnimap-open-connection): Use it.
proto-stream.el (open-proto-stream): Complete the documentation.
nnimap.el (nnimap-open-connection): Check for "OK" from the greeting.
nntp.el: Use proto-streams for the relevant connections types.
nntp.el (nntp-open-connection): Switch on STARTTLS on supported servers.
proto-stream.el (open-proto-stream): Add a way to specify what the end of a command is.
proto-stream.el (proto-stream-open-tls): Delete output from openssl if we're using tls.el.
proto-stream.el (proto-stream-open-network): If we don't have gnutls-cli or gnutls built in, then don't try to establish a STARTTLS connection.
color.el (color-lab->srgb): Fix function call name.
proto-stream.el: Fix the syntax in the comment.
nntp.el (nntp-open-connection): Fix the STARTTLS command syntax.
proto-stream.el (proto-stream-open-starttls): Actually implement the starttls.el STARTTLS.
proto-stream.el (proto-stream-always-use-starttls): New variable.
proto-stream.el (proto-stream-open-starttls): De-duplicate the starttls code.
proto-stream.el (proto-stream-open-starttls): Folded back into the main function.
proto-stream.el (proto-stream-command): Refactor out.
nnimap.el (nnimap-stream): Change default to `undecided'.
nnimap.el (nnimap-open-connection): If `nnimap-stream' is `undecided', try ssl first, and then network.
nnimap.el (nnimap-open-connection-1): Respect nnimap-server-port.
nnimap.el (nnimap-open-connection): Be more backwards-compatible.
proto-stream.el (open-protocol-stream): Renamed from open-proto-stream.
proto-stream.el (proto-stream-open-network): When doing opportunistic TLS upgrades we don't really care about the identity of the peer.
gnus.texi (Customizing the IMAP Connection): Note the new defaults.
gnus.texi (Direct Functions): Note the STARTTLS upgrade.
proto-stream.el (proto-stream-open-network): Force starttls.el to use gnutls-cli, since that what we've checked for.
proto-stream.el (proto-stream-always-use-starttls): Only default to t if open-gnutls-stream exists.
proto-stream.el (proto-stream-open-network): If STARTTLS failed, then just open a normal connection.
proto-stream.el (proto-stream-open-network): Wait until the greeting before doing STARTTLS.
nnimap.el (nnimap-open-connection-1): Always upgrade to STARTTLS (for backwards compatibility).
nnimap.el (nnimap-open-connection-1): Really respect nnimap-server-port.
nntp.el (nntp-open-connection): Provide a :success condition.
nnimap.el (nnimap-open-connection-1): Ditto.
proto-stream.el (proto-stream-open-network): See what the response to the STARTTLS command is.
proto-stream.el (proto-stream-open-network): Add some comments.
proto-stream.el: Fix example.
proto-stream.el (open-protocol-stream): Actually mention the STARTTLS upgrade.
nnir.el (nnir-get-active): Skip nnir-ignored-newsgroups when searching.
nnir.el (nnir-ignore-newsgroups): Fix default value.
nnir.el (nnir-run-gmane): Use mm-delete-duplicates instead of delete-dups that is not available in XEmacs 21.4.
mm-util.el (mm-delete-duplicates): Add comment.
gnus-sum.el (gnus-summary-delete-article): If delete fails don't change the registry.
nnimap.el (nnimap-open-connection-1): w32 open-network-stream doesn't seem to accept strings-with-numbers as port numbers.
color.el: fix docstring to use English rather than math notation for intervals.
shr.el (shr-find-fill-point): Don't break before apostrophes.
nnir.el (nnir-request-move-article): Bail out if no move support in group.
color.el (color-rgb->hsv): Fix docstring.
nnir.el (nnir-get-active): Improve active list retrieval.
shr.el (shr-find-fill-point): Work better for kinsoku chars and apostrophes.
gnus-gravatar.el (gnus-gravatar-size): Set gnus-gravatar-size to nil.
nnimap.el (nnimap-open-connection-1): Use gnus-string-match-p.
nnimap.el (nnimap-open-connection-1): Fix PREAUTH.
proto-stream.el (open-protocol-stream): All starttls connections are handled by the network handler.
gnus-gravatar.el (gnus-gravatar-insert): Delete unnecessary binding to t of inhibit-read-only since it is inside gnus-with-article-headers.
gnus-gravatar.el (gnus-gravatar-transform-address): Use mail-extract-address-components that supports non-ASCII names rather than mail-header-parse-addresses.
shr.el (shr-find-fill-point): Don't break line between kinsoku-bol characters.
gnus-gravatar.el (gnus-gravatar-insert): Allow LWSP in the middle of names.
nnmaildir.el (nnmaildir-request-set-mark): Add article to add-mark funcall.
gnus-msg.el: Remove nastygram thing.
message.el (message-from-style): Fix comment.
message.el (message-user-organization): Do not use gnus-local-organization.
gnus.el: Remove gnus-local-organization.
rtree.el: New file to handle range trees.
nnir.el, gnus-sum.el: Redo the way nnir handles registry updates.
rtree.el (rtree-extract): Simplify.
gnus-win.el (gnus-configure-windows): Remove Gnus 3.x setting support.
gnus-msg.el: Mark gnus-outgoing-message-group as obsolete.
gnus.texi (Archived Messages): Remove gnus-outgoing-message-group.
gnus-win.el (gnus-configure-frame): Remove old compatibility code.
rtree.el (rtree-memq): Rewrite it as a non-recursive function.
rtree.el (rtree-add, rtree-delq, rtree-length): Implement.
rtree.el (rtree-add): Make code slightly faster.
nnir.el: Allow modified summary-line-format in nnir summary buffers.