gnu: vm: Make a union of the visible packages; add /etc/profile.

* gnu/system/vm.scm (qemu-image): Add Guix as an input when
  INITIALIZE-STORE?.
  (union): New procedure.
  (system-qemu-image): Use it.  Build /etc/profile.  Pass PROFILE among
  #:inputs-to-copy instead of listing all the individual profiles.
  Remove explicit 'build-derivations' call.

gnu: vm: Support derivation objects as inputs.

* gnu/system/vm.scm (expression->derivation-in-linux-vm)[input-alist]:
  Add case for derivation? objects.
  Same for #:inputs values.
  (qemu-image)[input->name+derivation]: Likewise.

gnu: libksba: Update to 1.3.0.

* gnu/packages/gnupg.scm (libksba): Update to 1.3.0.

gnu: libgcrypt: Update to 1.5.3

* gnu/packages/gnupg.scm (libgcrypt): Update to 1.5.3.

gnu: gnupg: Update to 2.0.21.

* gnu/packages/gnupg.scm (gnupg): Update to 2.0.21.

gnu: pspp: Update to 0.8.1.

* gnu/packages/maths.scm (pspp): Update to 0.8.1.

gnu: fontconfig: Add and register gs-fonts.

* gnu/packages/fontutils.scm (fontconfig): Add gs-fonts as an input and
    register it in the configuration file; so any porgram using fontconfig
    should at least have the gs-fonts at its disposal.

gnu: guix: Rework 0.4 hack to gracefully handle lack of tarball.

* gnu/packages/package-management.scm (guix-0.4): Fall back to the
  source of GIUX when the tarball doesn't exist.

gnu: vm: Add a service for the Guix daemon.

* gnu/system/dmd.scm (guix-service): New procedure.
* gnu/system/vm.scm (system-qemu-image): Use it.

gnu: vm: Initialize the image's store.

* gnu/system/vm.scm (qemu-image): Add 'initialize-store?' keyword
  parameter.  Use 'guix-register' when INITIALIZE-STORE? is true.
  (system-qemu-image): Pass #:initialize-store? #t.

gnu: guix: Set $localstatedir; add gzip as input.

* gnu/packages/package-management.scm (guix): Add "--localstatedir=/var".
  Add GZIP as an explicit input, to avoid referring to the final gzip.

gnu: racket: Add dependency on GTK+.

* gnu/packages/scheme.scm (racket): Add dependency on GTK+ and
  gdk-pixbuf.

gnu: xorg: Fix xorg-server.

* gnu/packages/xorg.scm (xkbcomp-intermediate): New variable, serves as
    input to xkeyboard-config.
* gnu/packages/xorg.scm (xkeyboard-config): Add input xkbcomp-intermediate.
* gnu/packages/xorg.scm (xkbcomp): Add input xkeyboard-config.
* gnu/packages/xorg.scm (xorg-server): Adapt xkb paths and replace references
    to /bin/sh (with Ludovic Courtès <ludo@gnu.org>).

gnu: mutt: Add SASL for authenticated SMTP.

* gnu/packages/mail.scm (mutt): Add input cyrus-sasl.

gnu: Add mutt.

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

gnu: Add fetchmail.

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

gnu: Rename module mailutils to mail.

* gnu/packages/mail.scm: Rename from gnu/packages/mailutils.scm.
* gnu-system.am: Rename the module.

gnu: Add gnome-doc-utils.

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

gnu: Add gst-plugins-base.

* gnu/packages/gstreamer.scm (gst-plugins-base): New variable.

gnu: gstreamer: Depend on python-wrapper.

* gnu/packages/gstreamer.scm (gstreamer): Replace input python by
    python-wrapper.