gnu: manaplus: Update to 1.5.12.5.

* gnu/packages/games.scm (manaplus): Update to 1.5.12.5.

gnu: Add emulation-station.

* gnu/packages/games.scm (emulation-station): New variable.

gnu: Adjust formatting as recommended by 'guix lint'.

* gnu/packages/aidc.scm (barcode, qrencode),
  gnu/packages/bash.scm (bash, bash-completion),
  gnu/packages/busybox.scm (busybox),
  gnu/packages/cdrom.scm (cdparanoia),
  gnu/packages/cmake.scm (cmake),
  gnu/packages/conkeror.scm (conkeror),
  gnu/packages/cook.scm (cook),
  gnu/packages/curl.scm (curl),
  gnu/packages/docbook.scm (docbook-xsl),
  gnu/packages/enlightenment.scm (enlightenment),
  gnu/packages/games.scm (abbaye),
  gnu/packages/geeqie.scm (exiv2),
  gnu/packages/gimp.scm (gegl),
  gnu/packages/gl.scm (glu, freeglut, ftgl),
  gnu/packages/glib.scm (glib),
  gnu/packages/gnome.scm (orbit2, gconf, geocode-glib),
  gnu/packages/gstreamer.scm (gstreamer, gst-plugins-base),
  gnu/packages/linux.scm (util-linux),
  gnu/packages/lisp.scm (gcl, ecl),
  gnu/packages/maths.scm (gnuplot, hdf5),
  gnu/packages/ssh.scm (dropbear),
  gnu/packages/web.scm (json-c): Remove tabulations and trailing
  white spaces or reformat to fit within 80 columns.
* gnu/packages/audio.scm (aubio),
  gnu/packages/emacs.scm (emacs-s),
  gnu/packages/engineering.scm (geda-gaf),
  gnu/packages/games.scm (dosbox),
  gnu/packages/gnome.scm (gusb),
  gnu/packages/gtk.scm (gtk+),
  gnu/packages/guile.scm (guile-wisp),
  gnu/packages/hurd.scm (hurd-headers),
  gnu/packages/wm.scm (i3-wm): Adjust synopsis or description.

gnu: mupen64plus-core: Add comment.

* gnu/packages/games.scm (mupen64plus-core): Comment the reason for the
  supported-systems field.

gnu: mupen64plus-core: Specify supported-systems.

* gnu/packages/games.scm (mupen64plus-core): Specify supported-systems.

gnu: Add mupen64plus-ui-console.

* gnu/packages/games.scm (mupen64plus-ui-console): New variable.
* gnu/packages/patches/mupen64plus-ui-console-notice.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.

gnu: Add mupen64plus-video-z64.

* gnu/packages/games.scm (mupen64plus-video-z64): New variable.

gnu: Add mupen64plus-video-rice.

* gnu/packages/games.scm (mupen64plus-video-rice): New variable.

gnu: Add mupen64plus-video-glide64mk2.

* gnu/packages/games.scm (mupen64plus-video-glide64mk2): New variable.

gnu: Add mupen64plus-video-glide64.

* gnu/packages/games.scm (mupen64plus-video-glide64): New variable.

gnu: Add mupen64plus-video-arachnoid

* gnu/packages/games.scm (mupen64plus-video-arachnoid): New variable.

gnu: Add mupen64plus-rsp-z64.

* gnu/packages/games.scm (mupen64plus-rsp-z64): New variable.

gnu: Add mupen64plus-rsp-hle.

* gnu/packages/games.scm (mupen64plus-rsp-hle): New variable.

gnu: Add mupen64plus-input-sdl.

* gnu/packages/games.scm (mupen64plus-input-sdl): New variable.

gnu: Add mupen64plus-audio-sdl.

* gnu/packages/games.scm (mupen64plus-audio-sdl): New variable.

gnu: Add mupen64plus-core.

* gnu/packages/games.scm (mupen64plus-core): New variable.

gnu: manaplus: Update to 1.5.10.24.

* gnu/packages/games.scm (manaplus): Update to 1.5.10.24.

gnu: nestopia-ue: Use system zlib.

* gnu/packages/games.scm (nestopia-ue): Remove bundled zlib, patch files
  to include system zlib.h, and add zlib as input.

gnu: Add nestopia-ue.

* gnu/packages/games.scm (nestopia-ue): New variable.

Merge branch 'master' into dbus-update