doc: Add Texinfo HTML cross-reference file.

Fixes <http://bugs.gnu.org/22543>.

* doc/htmlxref.cnf: New file.
* doc.am (EXTRA_DIST): Add it.

gnu: icu4c: Fetch from sourceforge.

* gnu/packages/icu4c.scm (icu4c): Download via sourceforge mirrors.  The
  previous URL,
  http://download.icu-project.org/files/icu4c/55.1/icu4c-55_1-src.tgz,
  redirects to sourceforge, which then fails because that redirects to
  https and as the original URL didn't start with HTTPS, gnutls wasn't
  included in the downloader.

Update all sources from freedesktop.org to use https

* gnu/packages/xorg.scm:
* gnu/packages/xdisorg.scm:
* gnu/packages/video.scm:
* gnu/packages/tls.scm:
* gnu/packages/python.scm:
* gnu/packages/pulseaudio.scm:
* gnu/packages/polkit.scm:
* gnu/packages/pdf.scm:
* gnu/packages/libcanberra.scm:
* gnu/packages/gtk.scm:
* gnu/packages/gstreamer.scm:
* gnu/packages/gnome.scm:
* gnu/packages/glib.scm:
* gnu/packages/ghostscript.scm:
* gnu/packages/freedesktop.scm:
* gnu/packages/fontutils.scm: Update all sources hosted on freedesktop
  to fetch tarballs via https.  freedesktop.org appears to have updated
  recently to redirect all http to https.  As an exception, we leave
  pkg-config like it is, because pkg-config is needed to build gnutls,
  and without gnutls we can't download https URLs.

Revert "doc: Drop documentation of deprecated procedures."

This reverts commit f5c6e77a7f42e133df8c97d3b4798a11e6d58d06.

gnu: libx264: Update to 20160220-2245.

* gnu/packages/video.scm (libx264): Update to 20160220-2245.

gnu: xvid: Use 'modify-phases'.

* gnu/packages/video.scm (xvid)[arguments]: Use 'modify-phases'.

gnu: xvid: Update to 1.3.4.

* gnu/packages/video.scm (xvid): Update to 1.3.4.

linux-modules: Use normalized module names for 'modprobe.blacklist'.

* gnu/build/linux-modules.scm (normalize-module-name): New procedure.
(file-name->module-name): Use it.
(module-black-list): Expound docstring.

gnu: linux-libre: Update to 4.4.2.

* gnu/packages/linux.scm (linux-libre): Update to 4.4.2.

gnu: python-enum34: Remove python-setuptools from inputs.

* gnu/packages/python.scm (python-enum34)[inputs]: Remove
python-setuptools.

gnu: Don't use python-enum34 when building with python-3.4.

* gnu/packages/docker.scm (docker-compose)[inputs]: Remove python-enum34.
* gnu/packages/python.scm (python-parse-type)[inputs]: Likewise.
(behave)[inputs]: Likewise.
(python-cryptography)[propagated-inputs]: Likewise.
(python2-cryptography)[propagated-inputs]: Add python2-enum34.

gnu: Add python2-enum34.

* gnu/packages/python.scm (python2-enum34): New variable.

gnu: python-enum34: Update to 1.1.0.

* gnu/packages/python.scm (python-enum34): Update to 1.1.0.
[source]: Use pypi-uri.

gnu: dvtm: Update to 0.15.

* gnu/packages/dvtm.scm (dvtm): Update to 0.15.

gnu: abduco: Update to 0.5.

* gnu/packages/abduco.scm (abduco): Update to 0.5.

Revert "gnu: coreutils: Update URI for tail-inotify-race.patch."

This reverts commit 1a51cbc8251df5dbb6da05a58654c73f22eb3748.

gnu: dmd: Update URI of dmd-user-group.patch.

* gnu/packages/admin.scm (dmd)[source]: Update URI of patch.

gnu: coreutils: Update URI for tail-inotify-race.patch.

* gnu/packages/base.scm (coreutils)[source]: Update URI of patch.

gnu: wine: Update to 1.9.4.

* gnu/packages/wine.scm (wine): Update to 1.9.4.
[origin]: Remove snippet.
[arguments]: Set SHELL with make-flags.

import: gem: Add updater.

* guix/import/gem.scm (guix-package->gem-name,
  gem-package?, latest-release): New procedures.
  (%gem-updater): New variable.
  (rubygems-fetch): Wrap body in
  'call-with-output-file' and 'with-error-to-port'.
* guix/scripts/refresh.scm (%updaters): Add %GEM-UPDATER.
* doc/guix.texi (Invoking guix refresh): Mention RubyGems.