This reverts commit 5254c582efb3e7171e955dde653e7530d2d3ffef.

Until now @dircategory/@direntry entries were added only if
both TEXINFO_DIR_CATEGORY and TEXINFO_DIR_TITLE were set.
And the setting of TEXINFO_DIR_TITLE had to be careful to
provide exactly the right syntax.

This patch changes various things in this regard:
- Only require TEXINFO_DIR_CATEGORY in order to generate
  `@dircategory` and `@direntry`.
- Use the document title by default if TEXINFO_DIR_DESC is missing.
- Use the filename by default when TEXINFO_DIR_TITLE is missing.
- Try and make it harder to provide a direntry that does not
  have the right format or refers to a different filename than
  the one we're outputting to.

* lisp/org/ox-texinfo.el: Remove redundant `:group` arguments.
Prefer #' to quote function names.
(org-texinfo-template): Use sane defaults for `@direntry`.

* doc/misc/org.org (Texinfo specific export settings): Adjust accordingly.

dc4e6b13296 ; Update copyright years in more files
64b37776318 ; Run set-copyright from admin.el
8e1c56ae467 ; Add 2024 to copyright years

# Conflicts:
#	doc/misc/modus-themes.org
#	doc/misc/texinfo.tex
#	etc/NEWS
#	etc/refcards/ru-refcard.tex
#	etc/themes/modus-operandi-theme.el
#	etc/themes/modus-themes.el
#	etc/themes/modus-vivendi-theme.el
#	lib/alloca.in.h
#	lib/binary-io.h
#	lib/c-ctype.h
#	lib/c-strcasecmp.c
#	lib/c-strncasecmp.c
#	lib/careadlinkat.c
#	lib/cloexec.c
#	lib/close-stream.c
#	lib/diffseq.h
#	lib/dup2.c
#	lib/filemode.h
#	lib/fpending.c
#	lib/fpending.h
#	lib/fsusage.c
#	lib/getgroups.c
#	lib/getloadavg.c
#	lib/gettext.h
#	lib/gettime.c
#	lib/gettimeofday.c
#	lib/group-member.c
#	lib/malloc.c
#	lib/md5-stream.c
#	lib/md5.c
#	lib/md5.h
#	lib/memmem.c
#	lib/memrchr.c
#	lib/nanosleep.c
#	lib/save-cwd.h
#	lib/sha1.c
#	lib/sig2str.c
#	lib/stdlib.in.h
#	lib/strtoimax.c
#	lib/strtol.c
#	lib/strtoll.c
#	lib/time_r.c
#	lib/xalloc-oversized.h
#	lisp/auth-source-pass.el
#	lisp/emacs-lisp/lisp-mnt.el
#	lisp/emacs-lisp/timer.el
#	lisp/info-look.el
#	lisp/jit-lock.el
#	lisp/loadhist.el
#	lisp/mail/rmail.el
#	lisp/net/ntlm.el
#	lisp/net/webjump.el
#	lisp/progmodes/asm-mode.el
#	lisp/progmodes/project.el
#	lisp/progmodes/sh-script.el
#	lisp/textmodes/flyspell.el
#	lisp/textmodes/reftex-toc.el
#	lisp/textmodes/reftex.el
#	lisp/textmodes/tex-mode.el
#	lisp/url/url-gw.el
#	m4/alloca.m4
#	m4/clock_time.m4
#	m4/d-type.m4
#	m4/dirent_h.m4
#	m4/dup2.m4
#	m4/euidaccess.m4
#	m4/fchmodat.m4
#	m4/filemode.m4
#	m4/fsusage.m4
#	m4/getgroups.m4
#	m4/getloadavg.m4
#	m4/getrandom.m4
#	m4/gettime.m4
#	m4/gettimeofday.m4
#	m4/gnulib-common.m4
#	m4/group-member.m4
#	m4/inttypes.m4
#	m4/malloc.m4
#	m4/manywarnings.m4
#	m4/mempcpy.m4
#	m4/memrchr.m4
#	m4/mkostemp.m4
#	m4/mktime.m4
#	m4/nproc.m4
#	m4/nstrftime.m4
#	m4/pathmax.m4
#	m4/pipe2.m4
#	m4/pselect.m4
#	m4/pthread_sigmask.m4
#	m4/readlink.m4
#	m4/realloc.m4
#	m4/sig2str.m4
#	m4/ssize_t.m4
#	m4/stat-time.m4
#	m4/stddef_h.m4
#	m4/stdint.m4
#	m4/stdio_h.m4
#	m4/stdlib_h.m4
#	m4/stpcpy.m4
#	m4/strnlen.m4
#	m4/strtoimax.m4
#	m4/strtoll.m4
#	m4/time_h.m4
#	m4/timegm.m4
#	m4/timer_time.m4
#	m4/timespec.m4
#	m4/unistd_h.m4
#	m4/warnings.m4
#	nt/configure.bat
#	nt/preprep.c
#	test/lisp/register-tests.el

3204825f560 Fix mangled Subject header field when forwarding (Bug#67360)
7591acfe38e Update to Org 9.6.15
240b4594f11 ; * etc/TODO: Add an item about 'Info-hide-note-references'.
01be4fe39d7 * doc/emacs/custom.texi (Modifier Keys): Fix markup (bug#...
55555a6a0d1 org-protocol: Minor copy-edits to Commentary
4696869d3d5 Improve syntax highlighting for python-ts-mode

ce0ebb91f25 Improve documentation of read syntax and printed represen...
81f84b00a5d ; * doc/lispref/modes.texi (Other Font Lock Variables): A...
434592b0746 ; * lisp/dired.el (dired-use-ls-dired): Doc fix (bug#67053).
fe000236cf2 Improve documentation of signaling errors in batch mode
103ca678ac1 Fix treesit-simple-indent-presets docstring (bug#67007)
b7871cefe7b Prevent an infinite loop in todo-mode (bug#66994)
fa8cc4c9ee2 Fix cmake-ts-mode indentation (Bug#66845)
5bdc61bc0ef Update to Org 9.6.11
18e2de1bec9 ; * lisp/bindings.el (right-word, left-word): Doc fix.
4f0fc3bfda3 ; Document core input events problems with XInput2

Ref:
https://lists.gnu.org/r/emacs-devel/2016-01/msg01598.html
https://lists.gnu.org/r/emacs-devel/2016-01/msg01465.html

* doc/misc/org.org (External Links): Change an HTTPS link back to
HTTP, as it's used as an example to show the supported protocols.
Ref: https://lists.gnu.org/r/emacs-devel/2023-08/msg00018.html