gnu: gnupg: Update to 2.0.25 and 1.4.18.

* gnu/packages/gnupg.scm (gnupg): Update to 2.0.25.
  (gnupg-1): Update to 1.4.18.

gnu: Add maxima.

* gnu/packages/maths.scm (maxima): New variable.

gnu: Add gcl.

* gnu-system.am (GNU_SYSTEM_MODULES): Add new package.
* gnu/packages/lisp.scm: New file.

vm: Enable QEMU support in the freestanding VM image.

* gnu/system/vm.scm (system-qemu-image): Add 'initrd' field.

gnu: Avoid circular dependency among modules.

Reported by Alex Kost <alezost@gmail.com>.

* gnu/packages/python.scm: Don't use #:select for (gnu packages zip).

gnu: Add gegl and gimp

* gnu/packages/gimp.scm (gegl, gimp): New variables.

gnu: Add youtube-dl.

* gnu/packages/video.scm (youtube-dl): New variable.

gnu: pdf: Add PoDoFo.

* gnu/packages/pdf.scm (podofo): New variable.

gnu: Add cmatrix.

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

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

gnu: Add node.

* gnu-system.am (GNU_SYSTEM_MODULES): Add new package.
* gnu/packages/node.scm: New file.

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

services: Add lshd service.

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

linux-initrd: Rename 'qemu-initrd' to 'base-initrd'.

* gnu/system/linux-initrd.scm (qemu-initrd): Rename to...
  (base-initrd): ... this.
* gnu/system.scm (<operating-system>)[initrd]: Update accordingly.
* gnu/system/vm.scm (expression->derivation-in-linux-vm,
  system-disk-image, virtualized-operating-system): Likewise.

linux-initrd: Disable QEMU networking by default.

* gnu/system/linux-initrd.scm (qemu-initrd): Remove default value for
  #:qemu-networking?.
* gnu/system/vm.scm (expression->derivation-in-linux-vm): Pass
  #:qemu-networking? #t.
  (system-disk-image): Remove #:qemu-networking? #f.
  (virtualized-operating-system): Pass #:qemu-networking? #t.

linux-initrd: Make the virtio kernel modules optional.

* gnu/system/linux-initrd.scm (qemu-initrd): Add #:virtio? parameter.
  Use it.
* gnu/system/vm.scm (expression->derivation-in-linux-vm): Pass
  'qemu-initrd' #:virtio?.
  (virtualized-operating-system): Likewise.

gnu: Add jrnl, python-pycrypto, python-keyring, python-parsedatetime, and python-tzlocal.

* gnu/packages/jrnl.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu/packages/python.scm (python-pycrypto, python-keyring,
  python-dateutil-2, python-parsedatetime, python-tzlocal): New
  variables.

gnu: Add behave, python-six, python-enum34, python-parse-type, and python-parse.

* gnu/packages/python.scm (python-six, python-enum34, python-parse-type,
  python-parse, behave): New variables.

gnu: Add goffice and gnumeric

gnu/packages/gnome.scm (goffice, gnumeric): New variables.

gnu: Add ncmpcpp.

* gnu/packages/mpd.scm (ncmpcpp): New variable.

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

services: udev: Make sure modules are found, and use "udevadm settle".

* gnu/services/base.scm (udev-service): Set $LINUX_MODULE_DIRECTORY.  In
  the parent, invoke "udevadm settle" before "udevadm trigger".

system: Set $LINUX_MODULE_DIRECTORY as a function or /run/booted-system.

* gnu/system.scm (etc-directory): Remove #:kernel parameter.  Set
  LINUX_MODULE_DIRECTORY as a function or /run/booted-system.
  (operating-system-etc-directory): Update accordingly.