gnu: Add socat.

* gnu/packages/socat.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

linux-initrd: Add the 'virtio_console' module for QEMU guests.

* gnu/system/linux-initrd.scm (base-initrd)[virtio-modules]: Add
  "virtio_console".

build-system/python: Add handling of 'propagated-inputs' in
'package-with-explicit-python'.

* guix/build-system/python.scm (package-with-explicit-python): Add mapping for
  'propagated-inputs'.

gnu: atlas: Remove MIPS from 'supported-systems'.

* gnu/packages/maths.scm (atlas): Drop support for "mips64el-linux".

gnu: linux-libre: Update to 3.18

* gnu/packages/linux.scm (linux-libre): Update to version 3.18.

system: Add 'man-db' to '%base-packages'.

Suggested by Tsutsukakushi on #guix.

* gnu/system.scm (%base-packages): Add MAN-DB.

doc: Give example uses of 'deco'.

Suggested by Sleep_Walker on #guix.

* doc/guix.texi (Services): Add 'deco' examples.

nls: Update 'eo' translation.

gnu: python2-py2cairo: Fix 'license' field.

* gnu/packages/gtk.scm (python2-py2cairo)[license]: Change to a list of
  <license> (was a list of symbols.)

gnu: tzdata: Update to 2014j.

* gnu/packages/base.scm (tzdata): Update to 2014j.

gnu: fish: Use /etc as sysconfdir.

* gnu/packages/fish.scm (fish) [arguments]: Add #:configure-flags.
  [origin]: Add snippet.

gnu: Add libyubikey and ykclient.

* gnu/packages/yubico.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

guix system: Fix typo affecting 'guix system init'.

Fixes <http://bugs.gnu.org/19279>.
Fixes a regression introduced in cc7fa59.
Reported by Tomas Cech <tcech@suse.cz>.

* guix/scripts/system.scm (install): Fix order of arguments to 'lift'
  and 'lift2'.

guix: scripts: Parse $GUIX_BUILD_OPTIONS separately.

Appending to "raw" args broke optional parameters in 'guix package -I'
and 'guix package -A', and possibly other places.  Therefore, switch to
parsing each set of options on its own and append resulting alists
together afterwards.

* guix/scripts/archive.scm (parse-options-from): Rename from
  (parse-options) and add explicit argument.  New form of (parse-options)
  using its old algorithm via -from function.
* guix/scripts/build.scm: Ditto.
* guix/scripts/environment.scm: Ditto.
* guix/scripts/package.scm: Ditto.
* guix/scripts/system.scm: Ditto.
* tests/guix-package.sh: Add test.
* doc/guix.texi (Invoking guix build): Make it clear that the options
  are parsed independently.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

activation: Don't create unneeded "/var/guix/gcroots/etc-directory".

* gnu/build/activation.scm (activate-etc): Don't create
  "/var/guix/gcroots/etc-directory".

gnu: fish: Update to 2.1.1.

* gnu/packages/fish.scm (fish): Update to 2.1.1.

system: Make /boot/grub/grub.cfg an indirect GC root.

Fixes <http://bugs.gnu.org/19160>.

* guix/scripts/system.scm (install-grub*): Make /boot/grub/grub.cfg an
  indirect GC root.
* gnu/build/install.scm (install-grub): Make TARGET a symlink.
* gnu/build/vm.scm (register-grub.cfg-root): New procedure.
  (initialize-hard-disk): Use it.

nls: Update Hungarian translation.

guix system: Factorize 'grub-install' error handling, and use more 'mbegin'.

* guix/scripts/system.scm (install-grub*): New procedure.
  (install): Use it, and use 'mwhen?'.
  (perform-action) <reconfigure>: Likewise.

gnu: Add scipy.

* gnu/packages/python.scm (python-scipy, python2-scipy): New variables.