gnu: Add simple-scan.

* gnu/packages/gnome.scm (simple-scan): New variable.

gnu: Add gusb.

* gnu/packages/gnome.scm (gusb): New variable.

gnu: Add GVFS.

* gnu/packages/gnome.scm (gvfs): New variable.

gnu: colord: Propagate inputs.

* gnu/packages/gnome.scm (colord): Propagate inputs glib, eudev and lcms.

gnu: Prefer libgudev as GUDEV (GObject bindings for libudev) provider.

* gnu/packages/gnome.scm (upower, gnome-settings-daemon, rhythmbox)
  gnu/packages/xfce.scm (thunar, thunar-volman): Switch to libgudev as
  GUDEV provider.

gnu: Add libgudev.

* gnu/packages/gnome.scm (libgudev): New variable.

Merge branch 'core-updates'

Merge branch 'master' into core-updates

gnu packages: Clean up synopses and descriptions.

* gnu/packages/admin.scm, gnu/packages/algebra.scm, gnu/packages/audio.scm,
  gnu/packages/backup.scm, gnu/packages/base.scm, gnu/packages/bittorrent.scm,
  gnu/packages/code.scm, gnu/packages/compression.scm,
  gnu/packages/databases.scm, gnu/packages/enchant.scm,
  gnu/packages/firmware.scm, gnu/packages/fonts.scm,
  gnu/packages/freedesktop.scm, gnu/packages/games.scm, gnu/packages/gd.scm,
  gnu/packages/gl.scm, gnu/packages/gnome.scm, gnu/packages/gsasl.scm,
  gnu/packages/gstreamer.scm, gnu/packages/gtk.scm, gnu/packages/guile.scm,
  gnu/packages/haskell.scm, gnu/packages/language.scm,
  gnu/packages/lesstif.scm, gnu/packages/libreoffice.scm,
  gnu/packages/linux.scm, gnu/packages/llvm.scm, gnu/packages/maths.scm,
  gnu/packages/mcrypt.scm, gnu/packages/mit-krb5.scm, gnu/packages/mp3.scm,
  gnu/packages/ncdu.scm, gnu/packages/networking.scm, gnu/packages/ntp.scm,
  gnu/packages/ocaml.scm, gnu/packages/openbox.scm, gnu/packages/pdf.scm,
  gnu/packages/perl.scm, gnu/packages/pretty-print.scm,
  gnu/packages/pulseaudio.scm, gnu/packages/python.scm,
  gnu/packages/rdesktop.scm, gnu/packages/rdf.scm, gnu/packages/ruby.scm,
  gnu/packages/slang.scm, gnu/packages/slim.scm, gnu/packages/telephony.scm,
  gnu/packages/tls.scm, gnu/packages/tmux.scm, gnu/packages/tre.scm,
  gnu/packages/unrtf.scm, gnu/packages/version-control.scm,
  gnu/packages/vpn.scm, gnu/packages/web.scm, gnu/packages/wget.scm,
  gnu/packages/xdisorg.scm, gnu/packages/xfce.scm, gnu/packages/xiph.scm:
  Fix typos.  Trim long lines.  Add missing periods in the end of sentences.
  Use double spaces between sentences.  Remove trailing whitespaces.

gnu packages: Avoid description lines with leading "(".

* gnu/packages/curl.scm (curl): Reformat description to avoid a line
  beginning with "(" because such lines break font-lock highlighting
  in Emacs.
* gnu/packages/flashing-tools.scm (dfu-programmer): Likewise.
* gnu/packages/games.scm (gnugo): Likewise.
* gnu/packages/gnome.scm (json-glib): Likewise.
* gnu/packages/image.scm (jbig2dec): Likewise.
* gnu/packages/maths.scm (units): Likewise.
* gnu/packages/pdf.scm (mupdf): Likewise.
* gnu/packages/web.scm (perl-encode-locale): Likewise.
* gnu/packages/wordnet.scm (wordnet): Likewise.
* gnu/packages/xml.scm (libxml2):Likewise.

gnu: Add eog.

* gnu/packages/gnome.scm (eog): New variable.

gnu: libgnome: Leave only one 'propagated-inputs' field.

* gnu/packages/gnome.scm (libgnome): Merge the two 'propagated-inputs'
  fields (followup to 25338e9.)

gnu: Add gnome-common.

* gnu/packages/gnome.scm (gnome-common): New variable.

Merge branch 'master' into core-updates

gnu: libgnome: Move popt to propagated-inputs.

* gnu/packages/gnome.scm (libgnome)[inputs]: Move popt to ...
  [propagated-inputs]: ... here.

gnu: Add rhythmbox.

* gnu/packages/gnome.scm (rhythmbox): New variable.

gnu: gnome-terminal: Move dconf to propagated-inputs.

* gnu/packages/gnome.scm (gnome-terminal): Move dconf from inputs to
  propagated-inputs.

gnu: brasero: Update to 3.12.1, Add inputs.

* gnu/packages/gnome.scm (brasero): Update to 3.12.1.
  [inputs]: Add gobject-introspection, nettle, and totem-pl-parser.

gnu: Add totem.

* gnu/packages/gnome.scm (totem): New variable.

gnu: Add grilo-plugins.

* gnu/packages/gnome.scm (grilo-plugins): New variable.