gnu: python-natsort: Fix the test suite on slower machines.

* gnu/packages/python-xyz.scm (python-natsort)[arguments]: Add custom
phase to remove the time limit for some of the tests.

gnu: python-natsort: Reflow description.

* gnu/packages/python-xyz.scm (python-natsort)[description]: Rewrap
description to normal columns.

gnu: python-natsort: Honor the #:tests? flag.

* gnu/packages/python-xyz.scm (python-natsort)[arguments]: Adjust the
custom 'check phase to honor the #:tests? flag.

gnu: go-github.com-jtolds-gls: Skip tests with gccgo.

* gnu/packages/golang.scm (go-github.com-ktolds-gls)[arguments]: Don't
run the test suite when building with gccgo.

gnu: go-github-com-pkg-errors: Skip tests with gccgo.

* gnu/packages/golang.scm (go-github-com-pkg-errors)[arguments]: Don't
run the test suite when building with gccgo.

import/utils: beautify-description: Add case for "Implements".

* guix/import/utils.scm (beautify-description): Add case to transform
sentences beginning with "Implements".

gnu: Add r-aer.

* gnu/packages/cran.scm (r-aer): New variable.

gnu: Add r-ips.

* gnu/packages/cran.scm (r-ips): New variable.

gnu: Add r-scry.

* gnu/packages/bioconductor.scm (r-scry): New variable.

gnu: Add r-glmpca.

* gnu/packages/cran.scm (r-glmpca): New variable.

gnu: laminar: Do not use auto-generated tarball.

* gnu/packages/ci.scm (laminar)[source]: Use git-fetch.

gnu: laminar: Update to 1.2.

* gnu/packages/ci.scm (laminar): Update to 1.2.
[arguments]: Do not return #t from custom phases.

doc: Replace remaining 'unset mentions with %unset-value.

* doc/guix.texi (Networking Services): Replace 'unset with %unset-value.
(Power Management Services): Likewise.
(Complex Configurations): Likewise.

services: configuration: Change the value of the unset marker.

The new value of %unset-value sticks out more when something goes wrong, and
is also more unique; i.e. easier to search for.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

services: Use the new maybe/unset API.

* gnu/home/services/ssh.scm (serialize-address-family): Use the public API of
the maybe infrastructure.
* gnu/services/file-sharing.scm (serialize-maybe-string): Use maybe-value.
(serialize-maybe-file-object): Use maybe-value-set?.
* gnu/services/getmail.scm (getmail-retriever-configuration): Don't use
internals in unset field declarations.
(getmail-destination-configuration): Ditto.
* gnu/services/messaging.scm (raw-content?): Use maybe-value-set?.
(prosody-configuration): Use %unset-value.
* gnu/services/telephony.scm (jami-shepherd-services): Use maybe-value-set?.
(archive-name->username): Use maybe-value-set?.
* tests/services/configuration.scm ("maybe type, no default"): Use
%unset-value.

Modified-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

services: configuration: Add maybe-value exported procedure.

* gnu/services/configuration.scm (maybe-value): New procedure.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

services: configuration: Add %unset-value exported variable.

* gnu/services/configuration.scm (%unset-value): New variable.
(normalize-field-type+def): Use it.
(maybe-value-unset?): Use it.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

gnu: wesnoth: Update to 1.16.5.

* gnu/packages/games.scm (wesnoth): Update to 1.16.5.

services: configuration: Add a 'maybe-value-set?' procedure.

* gnu/services/configuration.scm (maybe-value-set?): New procedure.
* doc/guix.texi (Complex Configurations): Document it.  Remove comment showing
usage of 'maybe-string' with a default value, which doesn't make sense.

Co-authored-by: Attila Lendvai <attila@lendvai.name>

gnu: Rename procedure "qt5-urls" to "qt-urls" in (gnu packages qt).

This procedure now used by Qt5 and Qt6. "qt-urls" is more neutral than
original one.

* gnu/packages/qt.scm (qt5-urls): Rename to "qt-urls".
(qtbase-5)[source]: Use "qt-urls" for uri field.
(qtbase)[source]: Ditto.
(qt5compat)[source]: Ditto.
(qtsvg-5)[source]: Ditto.
(qtsvg)[source]: Ditto.
(qtimageformats)[source]: Ditto.
(qtx11extras)[source]: Ditto.
(qtxmlpatterns)[source]: Ditto.
(qtdeclarative-5)[source]: Ditto.
(qtdeclarative)[source]: Ditto.
(qtconnectivity)[source]: Ditto.
(qtwebsockets-5)[source]: Ditto.
(qtwebsockets)[source]: Ditto.
(qtsensors)[source]: Ditto.
(qtmultimedia-5)[source]: Ditto.
(qtshadertools)[source]: Ditto.
(qtmultimedia)[source]: Ditto.
(qtwayland)[source]: Ditto.
(qtserialport)[source]: Ditto.
(qtserialbus)[source]: Ditto.
(qtwebchannel-5)[source]: Ditto.
(qtwebchannel)[source]: Ditto.
(qtwebglplugin)[source]: Ditto.
(qtwebview)[source]: Ditto.
(qtlottie)[source]: Ditto.
(qttools-5)[source]: Ditto.
(qttools)[source]: Ditto.
(qtscript)[source]: Ditto.
(qtquickcontrols-5)[source]: Ditto.
(qtquickcontrols2-5)[source]: Ditto.
(qtgraphicaleffects)[source]: Ditto.
(qtgamepad)[source]: Ditto.
(qtscxml)[source]: Ditto.
(qtpositioning)[source]: Ditto.
(qtpurchasing)[source]: Ditto.
(qtcharts)[source]: Ditto.
(qtdatavis3d)[source]: Ditto.
(qtnetworkauth-5)[source]: Ditto.
(qtnetworkauth)[source]: Ditto.
(qtremoteobjects)[source]: Ditto.
(qtspeech)[source]: Ditto.
(qtwebengine-5)[source]: Ditto.
(qtwebengine)[source]: Ditto.

Signed-off-by: 宋文武 <iyzsong@member.fsf.org>