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*** Support for autodoc comments in Pike mode.
Autodoc comments for Pike are used to extract documentation from the
source, like Javadoc in Java.  Pike mode now recognize this markup in
comment prefixes and paragraph starts.

*** The comment prefix regexps on c-comment-prefix may be mode specific.
When c-comment-prefix is an association list, it specifies the comment
line prefix on a per-mode basis, like c-default-style does.  This
change came about to support the special autodoc comment prefix in
Pike mode only.

*** Better handling of syntactic errors.
The recovery after unbalanced parens earlier in the buffer has been
improved; CC Mode now reports them by dinging and giving a message
stating the offending line, but still recovers and indent the
following lines in a sane way (most of the time).  An "else" with no
matching "if" is handled similarly.  If an error is discovered while
indenting a region, the whole region is still indented and the error
is reported afterwards.

*** Lineup functions may now return absolute columns.
A lineup function can give an absolute column to indent the line to by
returning a vector with the desired column as the first element.

*** More robust and warning-free byte compilation.
Although this is strictly not a user visible change (well, depending
on the view of a user), it's still worth mentioning that CC Mode now
can be compiled in the standard ways without causing trouble.  Some
code have also been moved between the subpackages to enhance the
modularity somewhat.  Thanks to Martin Buchholz for doing the
groundwork.

*** c-style-variables-are-local-p now defaults to t.
This is an incompatible change that has been made to make the behavior
of the style system wrt global variable settings less confusing for
non-advanced users.  If you know what this variable does you might
want to set it to nil in your .emacs, otherwise you probably don't
have to bother.

Defaulting c-style-variables-are-local-p to t avoids the confusing
situation that occurs when a user sets some style variables globally
and edits both a Java and a non-Java file in the same Emacs session.
If the style variables aren't buffer local in this case, loading of
the second file will cause the default style (either "gnu" or "java"
by default) to override the global settings made by the user.

*** New initialization procedure for the style system.
When the initial style for a buffer is determined by CC Mode (from the
variable c-default-style), the global values of style variables now
take precedence over the values specified by the chosen style.  This
is different than the old behavior: previously, the style-specific
settings would override the global settings.  This change makes it
possible to do simple configuration in the intuitive way with
Customize or with setq lines in one's .emacs file.

By default, the global value of every style variable is the new
special symbol set-from-style, which causes the value to be taken from
the style system.  This means that in effect, only an explicit setting
of a style variable will cause the "overriding" behavior described
above.

Also note that global settings override style-specific settings *only*
when the initial style of a buffer is chosen by a CC Mode major mode
function.  When a style is chosen in other ways --- for example, by a
call like (c-set-style "gnu") in a hook, or via M-x c-set-style ---
then the style-specific values take precedence over any global style
values.  In Lisp terms, global values override style-specific values
only when the new second argument to c-set-style is non-nil; see the
function documentation for more info.

The purpose of these changes is to make it easier for users,
especially novice users, to do simple customizations with Customize or
with setq in their .emacs files.  On the other hand, the new system is
intended to be compatible with advanced users' customizations as well,
such as those that choose styles in hooks or whatnot.  This new system
is believed to be almost entirely compatible with current
configurations, in spite of the changed precedence between style and
global variable settings when a buffer's default style is set.

(Thanks to Eric Eide for clarifying this explanation a bit.)

**** c-offsets-alist is now a customizable variable.
This became possible as a result of the new initialization behavior.

This variable is treated slightly differently from the other style
variables; instead of using the symbol set-from-style, it will be
completed with the syntactic symbols it doesn't already contain when
the style is first initialized.  This means it now defaults to the
empty list to make all syntactic elements get their values from the
style system.

**** Compatibility variable to restore the old behavior.
In case your configuration doesn't work with this change, you can set
c-old-style-variable-behavior to non-nil to get the old behavior back
as far as possible.

*** Improvements to line breaking and text filling.
CC Mode now handles this more intelligently and seamlessly wrt the
surrounding code, especially inside comments.  For details see the new
chapter about this in the manual.

**** New variable to recognize comment line prefix decorations.
The variable c-comment-prefix-regexp has been added to properly
recognize the line prefix in both block and line comments.  It's
primarily used to initialize the various paragraph recognition and
adaptive filling variables that the text handling functions uses.

**** New variable c-block-comment-prefix.
This is a generalization of the now obsolete variable
c-comment-continuation-stars to handle arbitrary strings.

**** CC Mode now uses adaptive fill mode.
This to make it adapt better to the paragraph style inside comments.

It's also possible to use other adaptive filling packages inside CC
Mode, notably Kyle E. Jones' Filladapt mode (http://wonderworks.com/).
A new convenience function c-setup-filladapt sets up Filladapt for use
inside CC Mode.

Note though that the 2.12 version of Filladapt lacks a feature that
causes it to work suboptimally when c-comment-prefix-regexp can match
the empty string (which it commonly does).  A patch for that is
available from the CC Mode web site (http://www.python.org/emacs/
cc-mode/).

**** The variables `c-hanging-comment-starter-p' and
`c-hanging-comment-ender-p', which controlled how comment starters and
enders were filled, are not used anymore.  The new version of the
function `c-fill-paragraph' keeps the comment starters and enders as
they were before the filling.

**** It's now possible to selectively turn off auto filling.
The variable c-ignore-auto-fill is used to ignore auto fill mode in
specific contexts, e.g. in preprocessor directives and in string
literals.

**** New context sensitive line break function c-context-line-break.
It works like newline-and-indent in normal code, and adapts the line
prefix according to the comment style when used inside comments.  If
you're normally using newline-and-indent, you might want to switch to
this function.

*** Fixes to IDL mode.
It now does a better job in recognizing only the constructs relevant
to IDL.  E.g. it no longer matches "class" as the beginning of a
struct block, but it does match the CORBA 2.3 "valuetype" keyword.
Thanks to Eric Eide.

*** Improvements to the Whitesmith style.
It now keeps the style consistently on all levels and both when
opening braces hangs and when they don't.

**** New lineup function c-lineup-whitesmith-in-block.

*** New lineup functions c-lineup-template-args and c-indent-multi-line-block.
See their docstrings for details.  c-lineup-template-args does a
better job of tracking the brackets used as parens in C++ templates,
and is used by default to line up continued template arguments.

*** c-lineup-comment now preserves alignment with a comment on the
previous line.  It used to instead preserve comments that started in
the column specified by comment-column.

*** c-lineup-C-comments handles "free form" text comments.
In comments with a long delimiter line at the start, the indentation
is kept unchanged for lines that start with an empty comment line
prefix.  This is intended for the type of large block comments that
contain documentation with its own formatting.  In these you normally
don't want CC Mode to change the indentation.

*** The `c' syntactic symbol is now relative to the comment start
instead of the previous line, to make integers usable as lineup
arguments.

*** All lineup functions have gotten docstrings.

*** More preprocessor directive movement functions.
c-down-conditional does the reverse of c-up-conditional.
c-up-conditional-with-else and c-down-conditional-with-else are
variants of these that also stops at "#else" lines (suggested by Don
Provan).

*** Minor improvements to many movement functions in tricky situations.

** Dired changes

*** New variable `dired-recursive-deletes' determines if the delete
command will delete non-empty directories recursively.  The default
is, delete only empty directories.

*** New variable `dired-recursive-copies' determines if the copy
command will copy directories recursively.  The default is, do not
copy directories recursively.

*** In command `dired-do-shell-command' (usually bound to `!') a `?'
in the shell command has a special meaning similar to `*', but with
the difference that the command will be run on each file individually.

*** The new command `dired-find-alternate-file' (usually bound to `a')
replaces the Dired buffer with the buffer for an alternate file or
directory.

*** The new command `dired-show-file-type' (usually bound to `y') shows
a message in the echo area describing what type of file the point is on.
This command invokes the external program `file' do its work, and so
will only work on systems with that program, and will be only as
accurate or inaccurate as it is.

*** Dired now properly handles undo changes of adding/removing `-R'
from ls switches.

*** Dired commands that prompt for a destination file now allow the use
of the `M-n' command in the minibuffer to insert the source filename,
which the user can then edit.  This only works if there is a single
source file, not when operating on multiple marked files.

** Gnus changes.

The Gnus NEWS entries are short, but they reflect sweeping changes in
four areas: Article display treatment, MIME treatment,
internationalization and mail-fetching.

*** The mail-fetching functions have changed.  See the manual for the
many details.  In particular, all procmail fetching variables are gone.

If you used procmail like in

(setq nnmail-use-procmail t)
(setq nnmail-spool-file 'procmail)
(setq nnmail-procmail-directory "~/mail/incoming/")
(setq nnmail-procmail-suffix "\\.in")

this now has changed to

(setq mail-sources
      '((directory :path "~/mail/incoming/"
		   :suffix ".in")))

More information is available in the info doc at Select Methods ->
Getting Mail -> Mail Sources

*** Gnus is now a MIME-capable reader.  This affects many parts of
Gnus, and adds a slew of new commands.  See the manual for details.
Separate MIME packages like RMIME, mime-compose etc., will probably no
longer work; remove them and use the native facilities.

The FLIM/SEMI package still works with Emacs 21, but if you want to
use the native facilities, you must remove any mailcap.el[c] that was
installed by FLIM/SEMI version 1.13 or earlier.

*** Gnus has also been multilingualized.  This also affects too many
parts of Gnus to summarize here, and adds many new variables.  There
are built-in facilities equivalent to those of gnus-mule.el, which is
now just a compatibility layer.

*** gnus-mule.el is now just a compatibility layer over the built-in
Gnus facilities.

*** gnus-auto-select-first can now be a function to be
called to position point.

*** The user can now decide which extra headers should be included in
summary buffers and NOV files.

*** `gnus-article-display-hook' has been removed.  Instead, a number
of variables starting with `gnus-treat-' have been added.

*** The Gnus posting styles have been redone again and now work in a
subtly different manner.

*** New web-based backends have been added: nnslashdot, nnwarchive
and nnultimate.  nnweb has been revamped, again, to keep up with
ever-changing layouts.

*** Gnus can now read IMAP mail via nnimap.

*** There is image support of various kinds and some sound support.

** Changes in Texinfo mode.

*** A couple of new key bindings have been added for inserting Texinfo
macros

  Key binding	Macro
  -------------------------
  C-c C-c C-s	@strong
  C-c C-c C-e	@emph
  C-c C-c u	@uref
  C-c C-c q     @quotation
  C-c C-c m	@email
  C-c C-o       @<block> ... @end <block>
  M-RET         @item

*** The " key now inserts either " or `` or '' depending on context.

** Changes in Outline mode.

There is now support for Imenu to index headings.  A new command
`outline-headers-as-kill' copies the visible headings in the region to
the kill ring, e.g. to produce a table of contents.

** Changes to Emacs Server

*** The new option `server-kill-new-buffers' specifies what to do
with buffers when done with them.  If non-nil, the default, buffers
are killed, unless they were already present before visiting them with
Emacs Server.  If nil, `server-temp-file-regexp' specifies which
buffers to kill, as before.

Please note that only buffers are killed that still have a client,
i.e. buffers visited with `emacsclient --no-wait' are never killed in
this way.