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Problem reported by Artur Malabarba in:
http://lists.gnu.org/archive/html/emacs-devel/2015-11/msg01513.html
Most of these fixes are to documentation; many involve fixing
longstanding quoting glitches that are independent of the
recent substitute-command-keys changes.  The changes to code are:
* lisp/cedet/mode-local.el (mode-local-augment-function-help)
(describe-mode-local-overload):
Substitute docstrings before displaying them.
* lisp/emacs-lisp/cl-macs.el (cl--transform-lambda):
Quote the generated docstring for later substitution.

* configure.ac (wide-int): Clarify user-level advantages and
disadvantages.

* lisp/progmodes/xref.el (xref-backend-references): Improve doc string.

Problem reported by Pip Cet (Bug#21245).
This bug could occur in eval_sub if the C compiler reused
storage associated with the ‘argvals’ local after ‘argvals’
went out of scope, and if the Elisp debugger stopped on Elisp
function exit and accessed ‘argvals’.  It could also occur if
a variadic function was called with so many arguments (over
2048 args on x86-64) that SAFE_ALLOCA_LISP called malloc, then
SAFE_FREE freed the arguments, then the memory manager used
the storage for other purposes, then the debugger accessed the
arguments.
* src/eval.c (eval_sub): Declare ‘argvals’ at top level of
function body.	Simplify local decls.
When allocating args via SAFE_ALLOCA, call
debugger before invoking SAFE_FREE, as the debugger needs
access to the args.
(eval_sub, apply_lambda): Rework to avoid need for
set_backtrace_debug_on_exit hack.  This is cleaner,
and should work better with buggy custom debuggers.

(image-toggle-display-image): Read content from the buffer instead
of the file, if the buffer holds a decrypted data.  (Bug#21870)

This ports the recent unexelf.c changes to Fedora x86-64
when configured with GCC’s -fsanitize=undefined option.
* src/unexelf.c (unexec): Align new_data2_size to a multiple
of ElfW (Shdr)’s alignment, so that NEW_SECTION_H returns a
pointer aligned appropriately for its type.

* src/eval.c (funcall_lambda): Check size of compiled function
object.
(Ffetch_bytecode): Likewise.

* lisp/emacs-lisp/pcase.el (pcase-QPAT): Fix edebugging of backquoted
cons patterns. (Bug#21920)

Suggested by Stefan Monnier (Bug#21688).
* src/syntax.c (update_syntax_table_forward):
Remove recently-added PROPERTIZE arg, and assume it is true.
All callers changed.
* src/syntax.h (UPDATE_SYNTAX_TABLE_FORWARD_FAST):
Invoke update_syntax_table directly.

* lisp/progmodes/python.el (auto-mode-alist):
Recognize .pyw files.

* lisp/progmodes/ruby-mode.el (auto-mode-alist):
Recognize .rbw files.

* lisp/progmodes/ruby-mode.el (auto-mode-alist): Add grouping
around the extensions (bug#21257).

* lisp/progmodes/etags.el (tags-completion-at-point-function):
Use `goto-char', to avoid the end-of-buffer error (bug#20061).

list/progmodes/cc-engine.el (c-back-over-list-of-member-inits): New macro.
(c-back-over-member-initializers): Reformulate such that c-at-toplevel-p
is only called when a construct "looks right" rather than continually.
(c-guess-basic-syntax, CASE 5R): Add a check for the mode being C++ Mode.

* lisp/url/url-handlers.el (url-insert-file-contents): Move some code to
`url-insert-buffer-contents'.
(url-insert-buffer-contents): New function

(package--with-response-buffer): Use `url-insert-buffer-contents'.
The previous code had some issues with decoding. Refactoring that
function allows us to use the decoding from url-handlers while still
treating both sync and async requests the same.

* lisp/cedet/cedet-global.el (cedet-gnu-global-expand-filename):
* lisp/cedet/ede/locate.el (ede-locate-base):
* lisp/cedet/semantic/symref.el (semantic-symref-calculate-rootdir):
* src/fns.c (Fdelq): Improve doc string.

* lisp/progmodes/elisp-mode.el (elisp--xref-find-definitions): Add FIXME.

Trace can be disabled for groups of functions. By default, event
functions and functions that generate lots of output are disabled.

Trace output of Objective-C functions now use the "[ClassName
parameter:]" form.

* src/nsterm.h (NSTRACE_ALL_GROUPS, NSTRACE_GROUP_EVENTS)
(NSTRACE_GROUP_UPDATES, NSTRACE_GROUP_FRINGE, NSTRACE_GROUP_COLOR)
(NSTRACE_GROUP_GLYPHS, NSTRACE_GROUP_FOCUS): New macros,
controlling in which function groups trace should be active.
(NSTRACE_WHEN): Support for silencing a function, this also
silencing all called functions.
(NSTRACE_UNSILENCE): New macro, used to re-enable trace.
(NSTRACE_FMT_FSTYPE, NSTRACE_ARG_FSTYPE): New macros, used to
print the full screen state in NSTRACE functions.

* src/nsterm.m (nstrace_depth, nstrace_num): Made volatile as they
can be accessed from multiple threads.
(nstrace_enabled_global): New variable, when FALSE, trace is
silenced.
(nstrace_restore_global_trace_state): New function, used to
restore `nstrace_enabled_global' at end of block.
([EmacsView setFrame:], [EmacsWindow setFrame:display:])
([EmacsWindow setFrame:display:animation:])
([EmacsWindow setFrameTopLeftPoint:]): New functions, print trace
and call corresponding super function.
(Many functions): Add or enhance trace output.

* src/nsimage.m (ns_image_from_file): Enhanced trace output.

* src/nsfns.m (x_set_tool_bar_lines): Add trace output.

* src/nsmenu.m ([EmacsToolbar setVisible:]): New function, print trace
and call corresponding super function.

Earlier, when toggling the tool-bar in a maximized frame, the
frame size didn't match the number of text lines, leaving an
unused area at the bottom of the frame.

* nsfns.m (x_set_tool_bar_lines): Exit maximized and full height
fullscreen modes when tool bar is disabled.

* src/nsterm.h (EmacsView): Add missing declarations.
* src/nsterm.m ([EmacsView windowDidBecomeKey]): New method, like
the standard method but without the notification parameter.
Intended to be used for direct calls.
([EmacsView windowDidEnterFullScreen]): Call the non-notification
version of `windowDidBecomeKey'. Made the notification method call
the non-notification method instead of the vice versa.
(NSWindowDidEnterFullScreenNotification): Deleted, no longer
needed.

Previous code would signal an error when the face at point was
a manually built list of attributes such as '(:foregroud "white").

* test/automated/faces-tests.el (faces--test-color-at-point): Add a test

Problem reported by Ken Raeburn.
Solution suggested by Stefan Monnier (Bug#21688).
* src/regex.c (re_match_2_internal):
Use new _FAST functions to avoid regex code reentering itself.
* src/syntax.c (update_syntax_table_forward): New arg PROPERTIZE.
All callers changed.
* src/syntax.h (UPDATE_SYNTAX_TABLE_FORWARD_FAST)
(UPDATE_SYNTAX_TABLE_FAST): New inline functions.

* lisp/progmodes/ruby-mode.el (ruby-font-lock-keywords):
Handle required keyword arguments (bug#21367).
And highlight the colon together with the name.

* lisp/progmodes/elisp-mode.el (xref-backend-references):
Remove.

* lisp/progmodes/etags.el (xref-backend-references):
Remove.

* lisp/progmodes/xref.el (xref-backend-references):
Define the default implementation.

* lisp/progmodes/project.el (project--read-regexp):
Update to use the new xref API methods.

* lisp/progmodes/xref.el (xref-find-backend): Autoload.

In effect, partially reverting fe973fc2.

* lisp/progmodes/xref.el (xref-query-replace): Store the end
of each match as a marker again, instead of length.
(xref--query-replace-1): Update accordingly.

Signal user-errors instead.

* doc/emacs/help.texi (Help Summary): Mention "C-h o".
(Name Help): Document "C-h o" and describe-symbol.

* lisp/help-fns.el (describe-symbol): Doc fix.

* lisp/help-fns.el (describe-symbol): Avoid errors when the symbol
exists as a function/variable/face/etc., but is undocumented.

* test/automated/help-fns.el (help-fns-test-describe-symbol): New
test.

* doc/lispref/internals.texi (Building Emacs): Document that GNU
Make 3.81 or later is now required.

(package--with-work-buffer-async): Reimplement as
`package--with-response-buffer'.
(package--with-work-buffer): Mark obsolete.
(package--with-response-buffer): New macro. This is a more self
contained and less contrived version of
`package--with-work-buffer-async'.  It uses keyword arguments,
doesn't have async on the name, doesn't fallback on
`package--with-work-buffer', and has _much_ simpler error
handling.  On master, this macro will soon be part of another
library (either standalone or inside url.el), which is why this
commit is not to be merged back.

(package--check-signature, package--download-one-archive)
(package-install-from-archive, describe-package-1): Use it.

(package--download-and-read-archives): Let
`package--download-one-archive' take care of calling
`package--update-downloads-in-progress'.