Mew 6.9 (2023/02/10)

* renaming files
* moving files to sub directories
* s/Message-ID:/Message-Id:/
* adding mew-header-single-fields
* Update documentation for mew-prog-ssl-arg
	Tatsuya Kinoshita <tats>
* Define mew-prog-ssl-arg for mew-config-alist
	Tatsuya Kinoshita <tats>
* Add dependencies for async native compilation
	Tatsuya Kinoshita <tats>
* mew-vars3.el: require mew-env so mew-face-spec-func is defined.
	Thomas Danckaert <thomas.danckaert>
* Avoid non-lexbind dotimes for Emacs 29
	Tatsuya Kinoshita <tats>
* don't use local-write-file-hooks anymore
* using fork() instead of vfork().
* removing warnings
* Make sure macros are defined during native compilation.
	Thomas Danckaert <thomas.danckaert>
* Fix misuse of decode-syntax in mew-summary-folder-cache-save
	Tatsuya Kinoshita <tats>
* make sure that mew-home exists
	Naoya Yamashita <conao3>
* Check LF for IMAP FETCH to prevent redundant blank line in the header
	Tatsuya Kinoshita <tats>
* Use mew-smtp-ssl-port when mew-smtp-ssl for passtag and log
	Tatsuya Kinoshita <tats>
* Use ssl-p instead of ssl-process for mew-smtp-log()
	Tatsuya Kinoshita <tats>
* supporting Emacs 26.1 or later only.
* Simply use emacs-version for mew-x-mailer
	Tatsuya Kinoshita <tats>
* Improve gitlog2mewchanges to remove item marks
	Tatsuya Kinoshita <tats>
* Fix an issue in parallel build.
	Hiroki Sato <hrs>
* Avoid set-coding-priority for Emacs 28
	Tatsuya Kinoshita <tats>
* Stop using `message-box` on Windows to report that password is wrong.
	Yasuhiro KIMURA <yasu>
* Make mew-suffix customizable
	Yoshinari Nomura <nom>
* Fix prompt of mew-folder-new-message
	Yoshinari Nomura <nom>
* Fix bug that mew-passwd-gpg-version doesn't work as is expected on Windows
	Yasuhiro KIMURA <yasu>
* Support checkHost for stunnel 5.15
	Tatsuya Kinoshita <tats>
* Fix 'no info dir entry' warning when installing info files with MSYS2
	Yasuhiro KIMURA <yasu>
* Pick a subject sentence for gitlog2mewchanges
	Tatsuya Kinoshita <tats>
* Prevent incorrect mew-jpeg-size
	Murata Takashi <tmurata>
* Accept progressive JPEG for mew-jpeg-size
	Koichi Arakawa <arakawa>
* Simplify comments for gitlog2mewchanges
	Tatsuya Kinoshita <tats>
* Support the Credit: line for gitlog2mewchanges
	Tatsuya Kinoshita <tats>
* added the function to close the unnecessary queue buffer
	Wada Keiji <keiji>
* added the function to close the unnecessary queue buffer
	Wada Keiji <keiji>
* fixing a bug of #121 (#122).
* Add support for unix domain socket.
	Hiroki Sato <hrs>
* Don't add destination folder to mew-refile-{msgid,from}-alist if it is mew-imap-spam-folder.
	Yasuhiro KIMURA <yasu>
* Match exactly on an email address for mew-attach-pgp-public-key
	Tatsuya Kinoshita <tats>
* lock_mbox(): no deletion of lockfile which is put by other application
  after retry
	zinn-yama <zinn>
* generating configure by autoconf.
* Fix build with MSYS2.
	Yasuhiro KIMURA <yasu>
* Fix comparison between pointer and zero character constant in mewl.c
	Yasuhiro KIMURA <yasu>
* Fix mew-attach-pgp-public-key fails with gpg2
	Tatsuya Kinoshita <tats>
* Add patterns for Windows binaries to .gitignore
	Yasuhiro KIMURA <yasu>
* increasing the header limit due to many long-header messages recently.
* use mew-temp-file on windows platform.
	Shuichi KITAGUCHI <kit>
* hiding the Autocrypt: header.
* If stunnel supports foreground option, assume this is Unix-like system.
	Shuichi KITAGUCHI <kit>
* fixing doc and adding example.
	KIRIHARA Masaharu <mki_open>
* do not specify Unix-only option on Windows.
	Shuichi KITAGUCHI <kit>
* removing d stuff.
* updating 00readme for Haskell.
* updating doc.
