Run admin/update-copyright.

Also, the system-name variable is now obsolete.
Fixes Bug#19438.
* doc/lispref/os.texi (System Environment):
* etc/NEWS: Document this.
* doc/misc/efaq.texi:
(Displaying the current file name in the titlebar):
* lisp/desktop.el (desktop-save-frameset):
* lisp/dnd.el (dnd-get-local-file-uri):
* lisp/gnus/message.el (message-make-fqdn):
* lisp/gnus/nnvirtual.el (nnvirtual-retrieve-headers)
(nnvirtual-update-xref-header):
* lisp/nxml/rng-uri.el (rng-uri-file-name-1):
* lisp/org/org-clock.el (org-clock-save):
* src/filelock.c (current_lock_owner):
* src/xrdb.c (get_environ_db):
* src/xterm.c (same_x_server):
* src/xterm.c (x_term_init):
Prefer (system-name) to system-name, and avoid naming
locals 'system-name'.
* doc/misc/smtpmail.texi (Server workarounds): Fix grammar.
* lisp/startup.el (system-name): Now an obsolete variable.
* src/editfns.c (cached_system_name): New static var.
(init_and_cache_system_name): New function.
(init_editfns, Fsystem_name): Use it.
(syms_of_editfns): Initialize it and Vsystem_name to the same value.
* src/sysdep.c [HAVE_SOCKETS]: Don't include <sys/socket.h>, <netdb.h>.
(h_errno) [TRY_AGAIN && !HAVE_H_ERRNO]: Remove decl.
(init_system_name) [HAVE_SOCKETS]: Don't canonicalize the name.
Don't create a new string if the current value is already correct.

* .gitignore: Merge contents of subsidiary files and organize the
result so as to avoid duplication.  Remove no-longer needed entries.
* admin/charsets/.gitignore, admin/unidata/.gitignore:
* doc/lispintro/.gitignore, etc/.gitignore, leim/.gitignore:
* leim/ja-dic/.gitignore, lib-src/.gitignore, lisp/.gitignore:
* lisp/calc/.gitignore, lisp/calendar/.gitignore:
* lisp/cedet/.gitignore, lisp/emulation/.gitignore:
* lisp/erc/.gitignore, lisp/eshell/.gitignore, lisp/gnus/.gitignore:
* lisp/international/.gitignore, lisp/language/.gitignore:
* lisp/leim/.gitignore, lisp/leim/quail/.gitignore:
* lisp/mail/.gitignore, lisp/mh-e/.gitignore, lisp/net/.gitignore:
* lisp/nxml/.gitignore, lisp/obsolete/.gitignore:
* lisp/play/.gitignore, lisp/progmodes/.gitignore:
* lisp/term/.gitignore, lisp/textmodes/.gitignore:
* lisp/url/.gitignore, nt/.gitignore, src/.gitignore:
Remove; no longer needed.

* textmodes/tildify.el (tildify-foreach-region-function): New
variable specifying a function determining portions of buffer that
should be tildified.  It allows major modes to create a filtering
function more elaborate than a set of regular expressions.
Initialised to `tildify--deprecated-ignore-evironments' by default
to handle now deprecated `tildify-ignored-environments-alist'
variable.
(tildify--foreach-region): A new function that takes
`tildify-foreach-region-function' into account and calls callback
for regions of the buffer that should be tildified.
(tildify-foreach-ignore-environments): A new function which can be
partially applied and used as `tildify-foreach-region-function'.
(tildify-ignored-environments-alist, tildify--pick-alist-entry):
Mark as obsolete.
(tildify--find-env): Rename from `tildify-find-env' and mark as
obsolete.
(tildify--deprecated-ignore-evironments): New function,
immediately marked as obsolete, used to handle deprecated
`tildify-ignored-environments-alist'.

* textmodes/tex-mode.el (tex-common-initialization): Set
`tildify-foreach-region-function' variable in all variants of TeX
mode since `tildify-ignored-environments-alist' variable is now
empty by default.

* nxml/nxml-mode.el (nxml-mode): Ditto in `nxml-mode'.

* textmodes/sgml-mode.el (sgml-mode): Ditto in `sgml-mode'.

* textmodes/tildify.el (tildify-space-string): New variable for
specifying representation of a hard space -- a no-break space by
default.  Being a buffer-local variable it is much easier to
handle than `tildify-string-alist' that has been used so far.  It
also works better with derived modes.
(tildify-string-alist): Mark as obsolete.

* textmodes/tex-mode.el (tex-common-initialization): Set
`tildify-space-string' variable in all variants of TeX mode since
`tildify-string-alist' is now empty by default.

* nxml/nxml-mode.el (nxml-mode): Ditto in `nxml-mode'.  If
encoding supports it use no-break space instead of character
entity; this changes previous default which used a numeric
reference.

* textmodes/sgml-mode.el (sgml-mode): ditto in `sgml-mode'.  If
encoding does not support no-break space, use numeric reference;
this changes previous default which used named entity (“ ”)
in HTML mode.

(font-lock-fontify-buffer): Mark interactive-only.
(font-lock-multiline, font-lock-fontified, font-lock-set-defaults):
Make buffer-local.
(font-lock-specified-p): Remove redundant boundp check.
(font-lock-flush-function, font-lock-ensure-function): New vars.
(font-lock-turn-on-thing-lock): Set them.
(font-lock-default-fontify-buffer): Obey font-lock-dont-widen.
(font-lock-after-change-function): Make `old-len' optional.
(font-lock-set-defaults): Remove redundant `set' of font-lock-defaults.
Call font-lock-flush, just in case.
* lisp/progmodes/verilog-mode.el (verilog-preprocess): Disable workaround in
recent Emacsen.
* lisp/progmodes/vera-mode.el (vera-fontify-buffer): Declare obsolete.
(vera-mode-map, vera-mode-menu): Remove bindings to it.
* lisp/progmodes/idlw-help.el (idlwave-help-fontify): Use font-lock-ensure
and with-syntax-table.
* lisp/textmodes/conf-mode.el (conf-quote-normal):
* lisp/progmodes/sh-script.el (sh-set-shell):
* lisp/progmodes/prog-mode.el (prettify-symbols-mode):
* lisp/progmodes/f90.el (f90-font-lock-n):
* lisp/progmodes/cwarn.el (cwarn-mode):
* lisp/nxml/nxml-mode.el (nxml-toggle-char-ref-extra-display):
* lisp/progmodes/compile.el (compilation-setup, compilation--unsetup):
* lisp/hi-lock.el (hi-lock-mode, hi-lock-unface-buffer)
(hi-lock-set-pattern, hi-lock-set-file-patterns): Use font-lock-flush.
* lisp/mail/rmail.el (rmail-variables): Set font-lock-dont-widen instead of
font-lock-fontify-buffer-function and
font-lock-unfontify-buffer-function.
(rmail-unfontify-buffer-function, rmail-fontify-message):
Use with-silent-modifications.
* lisp/htmlfontify.el (hfy-force-fontification): Use jit-lock-fontify-now
and font-lock-ensure.
* lisp/bs.el (bs-show-in-buffer): Use font-lock-ensure.
* lisp/gnus/mm-view.el (mm-display-inline-fontify): Use font-lock-ensure.
* lisp/gnus/gnus-cite.el (gnus-message-citation-mode): Use font-lock-flush.
* lisp/org/org-compat.el (org-font-lock-ensure): New function.
* lisp/org/ox-odt.el (org-odt-do-format-code):
* lisp/org/ox-html.el (org-html-fontify-code):
* lisp/org/org.el (org-fontify-like-in-org-mode):
* lisp/org/org-src.el (org-src-font-lock-fontify-block):
* lisp/org/org-clock.el (org-clock-get-clocktable): Use it.
* lisp/org/ox-org.el (org-org-publish-to-org): Use it.  Avoid using find-file
from Elisp.
* test/automated/ruby-mode-tests.el (ruby-assert-face): Use font-lock-ensure.
(ruby-interpolation-keeps-non-quote-syntax): Use syntax-propertize.

was done.
* lisp/nxml/xmltok.el (xmltok-scan-after-comment-open): Extend unclosed
comment to EOB.

Fixes: debbugs:17264

* automated/electric-tests.el: Fix spelling error in test name.
(whitespace-skipping-for-quotes-not-outside):
Rename from whitespace-skipping-for-quotes-not-ouside.