gnu: Add ruby-unicode-plot.

* gnu/packages/plotutils.scm (ruby-unicode-plot): New variable.

Signed-off-by: Nicolas Goaziou <mail@nicolasgoaziou.fr>

services: mpd: Use proper records for user and group fields.

Deprecate using strings for these fields and prefer user-account
(resp. user-group) instead to avoid duplication within account-service-type.

Fixes #61570 <https://issues.guix.gnu.org/61570>.

* gnu/services/audio.scm (%mpd-user, %mpd-group)
(mpd-serialize-user-account, mpd-serialize-user-group)
(mpd-user-sanitizer, mpd-group-sanitizer): New variables.
(mpd-configuration)[user]: Use user-account as value type.
Sanitize via mpd-user-sanitizer.
[group]: Use user-group as value type.
Sanitize via mpd-group-sanitizer.
(mpd-shepherd-service): Adjust accordingly.
(mpd-accounts): Likewise.
* doc/guix.texi (Audio Services)[Music Player Daemon]: Likewise.

Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>

services: mpd: Fix unintentional API breakage for mixer-type field.

* gnu/services/audio.scm (mpd-output)[mixer-type]: Use sanitizer to
accept both strings and symbols as values.

Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>

gnu: Add python-clingraph.

* gnu/packages/potassco.scm (python-clingraph): New variable.

gnu: Separate potassco packages into their own module.

* gnu/packages/potassco.scm: New file.
* gnu/packages/maths.scm (libpotassco, clasp, clingo, python-clingo)
(python-telingo): Move to potassco module.  Adjust imports accordingly.
* gnu/packages/emacs-xyz.scm (emacs-pasp-mode): Move to potassco module.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add %D%/packages/potassco.scm.

gnu: Add mecab-unidic.

* gnu/packages/language.scm (mecab-unidic): New variable.

gnu: Add mecab-ipadic.

* gnu/packages/language.scm (mecab-ipadic): New variable.

gnu: Add mecab.

* gnu/packages/language.scm (mecab): New variable.
* gnu/packages/patches/mecab-variable-param.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu: libexif: Update home page.

* gnu/packages/photo.scm (libexif) [home-page]: Update URL.

gnu: python-gst: Update to 1.22.2.

* gnu/packages/gstreamer.scm (python-gst): Update to 1.22.2.

gnu: gst-editing-services: Update to 1.22.2.

* gnu/packages/gstreamer.scm (gst-editing-services): Update to 1.22.2.

gnu: gst-libav: Update to 1.22.2.

* gnu/packages/gstreamer.scm (gst-libav): Update to 1.22.2.

gnu: gst-plugins-ugly: Update to 1.22.2.

* gnu/packages/gstreamer.scm (gst-plugins-ugly): Update to 1.22.2.

gnu: gst-plugins-bad: Update to 1.22.2.

* gnu/packages/gstreamer.scm (gst-plugins-bad): Update to 1.22.2.

gnu: gst-plugins-good: Update to 1.22.2.

* gnu/packages/gstreamer.scm (gst-plugins-good): Update to 1.22.2.

gnu: gst-plugins-base: Update to 1.22.2.

* gnu/packages/gstreamer.scm (gst-plugins-base): Update to 1.22.2.

gnu: gstreamer: Update to 1.22.2.

* gnu/packages/gstreamer.scm (gstreamer): Update to 1.22.2.

gnu: gstreamer-docs: Update to 1.22.2.

* gnu/packages/gstreamer.scm (gstreamer-docs): Update to 1.22.2.

gnu: python-trio-typing: Switch to pyproject-build-system.

* gnu/packages/python-xyz.scm (python-trio-typing) [source]: Fix indentation.
[build-system]: Use pyproject-build-system.
[arguments]: Delete field.

gnu: xpra: Remove input labels and use gexps.

* gnu/packages/xorg.scm (xpra) [inputs]: Remove labels.
[arguments]: Use gexps.  Remove trailing #t in phases.  Use search-input-file
and this-package-input in the fix-paths phase.  Use search-input-file in
wrap-program.