gnu: Add emacs-org-contrib.

* gnu/packages/emacs.scm (emacs-org-contrib): New variable.

gnu: tmux: Update to 2.6.

* gnu/packages/tmux.scm (tmux): Update to 2.6.

gnu: youtube-dl: Update to 2017.10.15.1.

* gnu/packages/video.scm (youtube-dl): Update to 2017.10.15.1.

gnu: baobab: Update to 3.26.1.

* gnu/packages/gnome.scm (baobab): Update to 3.26.1.

gnu: Add cinnamon-desktop.

* gnu/packages/cinnamon.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

Signed-off-by: Christopher Baines <mail@cbaines.net>

emacs-build-system: Change how patch-el-files substitutes commands.

Previously the regex would match from /bin/ to a closing quote. However, this
is greedy, so will match up until the last ". This causes problems when there
are several quotes on the same line, for example:

org-effectiveness.el:
196:      (call-process "/bin/bash" nil t nil "-c" strplot)

Therefore, change . to \S so that it doesn't include whitespace
characters. Changing to a lazy quantifier would be an option, if that were
supported.

* guix/build/emacs-build-system.scm (patch-el-files): Change the regular
  expression used.

emacs-build-system: Handle missing programs when patching.

Previously the string-append here would error, which isn't useful as it
doesn't tell you which command couldn't be found. To make the error
actionable, catch it earlier, and explicitly error.

* guix/build/emacs-build-system.scm (patch-el-files): Handle (which cmd)
  returning #f.

gnu: propeller-development-suite: Use stable release.

* gnu/packages/embedded.scm (propeller-binutils): Take sources from
release_1_0 branch.
[arguments]: Remove "patch-/bin/sh-in-tests" phase; add "chdir" phase; disable
Werror flag.
(propeller-gcc-4): Use sources from release_1_0 branch.
[arguments]: Add "chdir" phase.
[home-page]: Change to official home page.
(proplib): Use sources from release_1_0 branch.
[arguments]: Add "chdir" phase; remove outdated patch from "fix-Makefile"
phase; do not build and install tiny library.
[home-page]: Change to official home page.
(propeller-load): Use sources from release_1_0 branch.
[arguments]: Add "chdir" phase.
[home-page]: Change to official home page.

gnu: maxima: Update to 5.41.0.

* gnu/packages/maths.scm (maxima): Update to 5.41.0.

gnu: ruby-ffi: Move to libffi.scm.

* gnu/packages/ruby.scm (ruby-ffi): Move from here ...
* gnu/packages/libffi.scm: ... to here.

gnu: python-cffi: Move to libffi.scm

* gnu/packages/python.scm (python-cffi): Move from here ...
* gnu/packages/libffi.scm: ... to here.
* gnu/packages/crypto.scm, gnu/packages/password-utils.scm: Adjust
module imports.

gnu: python-cffi: Update to 1.11.2.

* gnu/packages/python.scm (python-cffi): Update to 1.11.2.
[home-page]: Use 'https'.

gnu: python-cffi: Disable test that fails on aarch64.

* gnu/packages/python.cm (python-cffi)[arguments]: Disable test that
is known to fail on aarch64.

gnu: fluidsynth: Update to 1.1.8.

* gnu/packages/audio.scm (fluidsynth): Update to 1.1.8.
[build-system]: Use cmake-build-system.
[arguments]: Disable tests; add phase "fix-libdir"; remove build phase
"remove-broken-symlinks".
[license]: Change to lpgl2.1+.

gnu: linux-libre: Update to 4.13.7.

* gnu/packages/linux.scm (%linux-libre-version): Update to 4.13.7.
(%linux-libre-hash): Update hash.

gnu: cups-minimal: Mark up description.

* gnu/packages/cups.scm (cups-minimal)[description]: Use @dfn.

gnu: cups-filters: Download over HTTPS.

* gnu/packages/cups.scm (cups-filters)[source]: Use HTTPS.

gnu: Add python-pyqrcode.

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

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: Add python-pynacl.

* gnu/packages/crypto.scm (python-pynacl): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: Add python-py-ubjson.

* gnu/packages/web.scm (python-py-ubjson): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>