Merge changes made in Gnus trunk.

nndraft.el (nndraft-request-expire-articles): Use the group name instead if "nndraft".
gnus.texi (Using IMAP): Remove the @acronyms from the headings.
nnregistry.el: Added.
nnimap.el (nnimap-insert-partial-structure): Be way more permissive when interpreting the structures.
GNUS-NEWS: Minor error in GNUS-NEWS - password-cache.el.
nnimap.el (nnimap-request-accept-article): Add \r\n to the lines to make this work with Cyrus.
gnus-registry.el: Don't prompt on load, which makes it impossible to build Gnus.
gnus-gravatar.el: Add gnus-gravatar-properties.
gnus-agent.el, gnus-art.el, gnus-bookmark.el, gnus-dired.el, gnus-group.el,\
 gnus-int.el, gnus-msg.el, gnus-registry.el, gnus-score.el, gnus-srvr.el,\
 gnus-sum.el, gnus-topic.el, gnus-util.el, gnus.el, mm-decode.el, mm-util.el,\
 mm-view.el, mml-smime.el, mml.el, nnmairix.el, nnrss.el, smime.el:\
 Introduce gnus-completing-read.
gnus-util.el: Make completing-read function configurable.
gnus-util.el: Add requires and fix history for iswitchb.
webmail.el: Remove netscape/my-deja, since they no longer exist.
gnus.el (gnus-local-domain): Declare variable obsolete.
nnimap.el (nnimap-insert-partial-structure): Get the type from the correct slot, too.
pop3.el (pop3-send-streaming-command, pop3-stream-length): New variable.
nnimap.el (nnimap-open-connection): Revert the auto-network->starttls code.
nnimap.el (nnimap-request-set-mark): Erase the buffer before issuing commands.
nnimap.el (nnimap-split-rule): Mark as obsolete.
gnus-sum.el (gnus-valid-move-group-p): Make sure that `group' is a symbol.
nnimap.el (nnimap-split-incoming-mail): Allow `default' as nnimap-split-methods value.
nnimap.el (nnimap-request-article): Downcase the NILs so that they are nil.
nndoc.el (nndoc-retrieve-groups): New function.
gnus.texi: Fix Gravatar documentation.

lisp/gnus/gnus-msg.el

@@ -578,8 +578,8 @@ If ARG is 1, prompt for a group name to find the posting style."
 		(if arg
 		    (if (= 1 (prefix-numeric-value arg))
 			(gnus-group-completing-read
-			 "Use posting style of group: "
-			 nil nil (gnus-read-active-file-p))
+			 "Use posting style of group"
+			 nil (gnus-read-active-file-p))
 		      (gnus-group-group-name))
 		  ""))
 	  ;; #### see comment in gnus-setup-message -- drv
@@ -607,8 +607,8 @@ network.  The corresponding back end must have a 'request-post method."
 	  (setq gnus-newsgroup-name
 		(if arg
 		    (if (= 1 (prefix-numeric-value arg))
-			(gnus-group-completing-read "Use group: "
-						    nil nil
+			(gnus-group-completing-read "Use group"
+						    nil
 						    (gnus-read-active-file-p))
 		      (gnus-group-group-name))
 		  ""))
@@ -628,7 +628,7 @@ a news."
   (let ((gnus-newsgroup-name
 	 (if arg
 	     (if (= 1 (prefix-numeric-value arg))
-		 (gnus-group-completing-read "Newsgroup: " nil nil
+		 (gnus-group-completing-read "Newsgroup" nil
 					     (gnus-read-active-file-p))
 	       (gnus-group-group-name))
 	   ""))
@@ -654,8 +654,8 @@ posting style."
 	  (setq gnus-newsgroup-name
 		(if arg
 		    (if (= 1 (prefix-numeric-value arg))
-			(gnus-group-completing-read "Use group: "
-						    nil nil
+			(gnus-group-completing-read "Use group"
+						    nil
 						    (gnus-read-active-file-p))
 		      "")
 		  gnus-newsgroup-name))
@@ -684,8 +684,8 @@ network.  The corresponding back end must have a 'request-post method."
 	  (setq gnus-newsgroup-name
 		(if arg
 		    (if (= 1 (prefix-numeric-value arg))
-			(gnus-group-completing-read "Use group: "
-						    nil nil
+			(gnus-group-completing-read "Use group"
+						    nil
 						    (gnus-read-active-file-p))
 		      "")
 		  gnus-newsgroup-name))
@@ -710,7 +710,7 @@ a news."
   (let ((gnus-newsgroup-name
 	 (if arg
 	     (if (= 1 (prefix-numeric-value arg))
-		 (gnus-group-completing-read "Newsgroup: " nil nil
+		 (gnus-group-completing-read "Newsgroup" nil
 					     (gnus-read-active-file-p))
 	       "")
 	   gnus-newsgroup-name))
@@ -1028,8 +1028,8 @@ If SILENT, don't prompt the user."
 			 gnus-last-posting-server)
 		    ;; Just use the last value.
 		    gnus-last-posting-server
-		  (completing-read
-		   "Posting method: " method-alist nil t
+		  (gnus-completing-read
+		   "Posting method" (mapcar 'car method-alist) t
 		   (cons (or gnus-last-posting-server "") 0))))
 	  method-alist))))
      ;; Override normal method.
@@ -1487,7 +1487,7 @@ If YANK is non-nil, include the original article."
 (defun gnus-summary-yank-message (buffer n)
   "Yank the current article into a composed message."
   (interactive
-   (list (completing-read "Buffer: " (mapcar 'list (message-buffers)) nil t)
+   (list (gnus-completing-read "Buffer" (message-buffers) t)
 	 current-prefix-arg))
   (gnus-summary-iterate n
     (let ((gnus-inhibit-treatment t))