gnu: python-sphinx-cloud-sptheme: Update to 1.8.0.

* gnu/packages/python.scm (python-sphinx-cloud-sptheme): Update to 1.8.0.

gnu: python-wcwidth: Update to 0.1.7.

* gnu/packages/python.scm (python-wcwidth): Update to 0.1.7.
[source]: Use pypi-uri.

gnu: python-markdown: Update to 2.6.8.

* gnu/packages/python.scm (python-markdown): Update to 2.6.8.

gnu: dns: Return #t instead of something undefined.

* gnu/packages/dns.scm (yadifa, knot)[arguments]: Return #t after calling
‘substitute*’.
(knot)[source]: Return #t after calling ‘delete-file-recursively’.

file-systems: Add missing docstring.

* gnu/system/file-systems.scm (file-system-type-predicate): Add
docstring.

file-systems: Do not use (gnu packages …).

Fixes a regression introduced in
7208995426714c9fc3ad59cadc3cc0f52df0f018 whereby (gnu system
file-systems) would pull in (gnu packages …) module, which in turn
breaks when importing things like (gnu build shepherd).

* gnu/system/file-systems.scm (file-system-type-predicate): Export.
(file-system-packages): Move to...
* gnu/system/linux-initrd.scm (file-system-packages): ... here.  Add
docstring.
* gnu/services/base.scm: Use it.
* tests/file-systems.scm ("does not pull (gnu packages …)"): New test.

gnu: vapoursynth: Update to 37.

* gnu/packages/video.scm (vapoursynth): Update to 37.

gnu: zimg: Update to 2.5.

* gnu/packages/image.scm (zimg): Update to 2.5.

tests: ssh: Add a test for SFTP.

* gnu/tests/ssh.scm (run-ssh-test): Introduce "SFTP file writing and reading".
Make 'sftp?' a keyword parameter.
(%test-openssh): Pass #:sftp? #t to 'run-ssh-test'.

tests: ssh: Abstract session connection and authentication.

* gnu/tests/ssh.scm (run-ssh-test): Introduce make-session-for-test,
call-with-connected-session and call-with-connected-session/auth.
(run-ssh-test)["connect"]: Rename to "shell command".  Abstract its session
connection and authentication work into the above three functions.

services: openssh: Add 'subsystems' option.

* gnu/services/ssh.scm (openssh-config-file): Add it.
(<openssh-configuration>)[subsystems]: Add it.
* doc/guix.texi (Networking Services): Document it.

services: openssh: Cosmetic changes.

* gnu/services/ssh.scm (<openssh-configuration>): Reformat to fit in 80
columns.

gnu: Add lmms.

* gnu/packages/music.scm (lmms): New variable.

Signed-off-by: Leo Famulari <leo@famulari.name>

gnu: Add megaglest.

* gnu/packages/games.scm (megaglest): New variable.

Signed-off-by: Leo Famulari <leo@famulari.name>

gnu: Add megaglest-data.

* gnu/packages/games.scm (megaglest-data): New variable.

Signed-off-by: Leo Famulari <leo@famulari.name>

gnu: ots: Use 'modify-phases' syntax.

* gnu/packages/ots.scm (ots)[arguments]: Use 'modify-phases' syntax.

gnu: ots: Add download mirror.

* gnu/packages/ots.scm (ots)[source]: Add Debian mirror.

gnu: Adjust asciidoc-related build options.

Commits 9099a45792306fade2d9ca55138e49ef4f01f1ea and
3078821d1380c26c738be6b5d430c595327d401f make many package inputs and
build configurations related to asciidoc obsolete.

* gnu/packages/compton.scm (compton)[inputs]: Remove docbook-xml,
libxml2 and libxslt.
* gnu/packages/mail.scm (offlinemap)[native-inputs]: Remove libxslt.
* gnu/packages/linux.scm (btrfs-progs)[native-inputs]: Remove docbook-xml.
(perf)[inputs]: Remove docbook-xml and libxslt.
* gnu/packages/text-editors.scm (kakoune)[native-inputs]: Remove libxslt.
* gnu/packages/version-control.scm (cgit)[native-inputs]: Remove
docbook-xml, docbook-xsl, libxml2 and libxslt.
(cvs-fast-export)[native-inputs]: Remove docbook-xml, docbook-xsl,
libxml2 and libxslt.
* gnu/packages/web.scm (qutebrowser)[native-inputs]: Remove docbook-xml,
docbook-xsl, libxml2, and libxslt.
(tinyproxy)[native-inputs]: Remove docbook-xml, docbook-xsl, libxml2 and
libxslt.
* gnu/packages/wm.scm (awesome)[make-flags]: Remove XML_CATALOG_FILES flag.
(i3-wm)[inputs]: Remove docbook-xml.
[native-inputs]: Add libxml2.

gnu: Add swaks.

* gnu/packages/mail.scm (swaks): New variable.

Signed-off-by: Marius Bakke <mbakke@fastmail.com>

gnu: git: Update to 2.12.1.

* gnu/packages/version-control.scm (git): Update to 2.12.1.