gnu: Add emacs-slime.

* gnu/packages/emacs.scm (emacs-slime): New variable.

gnu: Add emacs-constants.

* gnu/packages/emacs.scm (emacs-constants): New variable.
* gnu/packages/patches/emacs-constants-lisp-like.patch: New patch.
* gnu-system.am (dist_patch_DATA): Add it.

gnu: Add emacs-mit-scheme-doc.

* gnu/packages/emacs.scm (emacs-mit-scheme-doc): New variable.

gnu: Add emacs-scheme-complete.

* gnu/packages/emacs.scm (emacs-scheme-complete): New variable.
* gnu/packages/patches/emacs-scheme-complete-scheme-r5rs-info.patch: New patch.
* gnu-system.am (dist_patch_DATA): Add the new patch.

gnu: emacs: Find packages in "~/.guix-profile".

* gnu/packages/emacs.scm (emacs)[inputs]: Add 'guix-src' input.
  [arguments]: Add 'install-site-start' phase.

Co-authored-by: Alex Kost <alezost@gmail.com>

Merge branch 'core-updates'

Merge branch 'master' into core-updates

gnu: magit: Update to 2.4.0.

* gnu/packages/emacs.scm (magit): Update to 2.4.0.

Merge branch 'master' into core-updates

gnu: Add emacs-undo-tree.

 * gnu/packages/emacs.scm (emacs-undo-tree): New variable.

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

gnu: emacs: Remove 'info.info'.

* gnu/packages/emacs.scm (emacs)[arguments]: Use 'modify-phases'.  Add
'remove-info.info' phase.

Merge branch 'master' into core-updates

gnu: emacs-w3m: Update to 1.4.538+0.20141022.

* gnu/packages/emacs.scm (emacs-w3m): Update to 1.4.538+0.20141022.
  [arguments]: Use '--without-compress-install' configure flag.

gnu: emacs-w3m: Use 'modify-syntax'.

* gnu/packages/emacs.scm (emacs-w3m)[arguments]: Use 'modify-syntax'.

gnu: paredit: Update to 24.

* gnu/packages/emacs.scm (paredit): Update to 24.

gnu: magit: Update to 2.3.1.

* gnu/packages/emacs.scm (magit): Update to 2.3.1.

gnu: emacs-dash: Update to 2.12.1.

* gnu/packages/emacs.scm (emacs-dash): Update to 2.12.1.

gnu: emacs-pdf-tools: Update to 0.70.

* gnu/packages/emacs.scm (emacs-pdf-tools): Update to 0.70.

gnu: emacs: Honor 'SOURCE_DATE_EPOCH'.

Suggested by Ludovic Courtès <ludo@gnu.org>.

* gnu/packages/patches/emacs-source-date-epoch.patch: New patch.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/emacs.scm (emacs)[source]: Use it.

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.