gnu: Add Anonymous Pro fonts.

* gnu/packages/fonts.scm (font-anonymous-pro): New variable.

Signed-off-by: Alex Kost <alezost@gmail.com>

gnu: Add ruby-nokogiri.

Co-Authored-By: Pjotr Prins <pjotr.public01@thebird.nl>

* gnu/packages/ruby.scm (ruby-nokogiri): New variable.

gnu: Add ruby-mini-portile.

* gnu/packages/ruby.scm (ruby-mini-portile): New variable.

gnu: Add ruby-minitar.

* gnu/packages/ruby.scm (ruby-minitar): New variable.

gnu: Remove #:select from module import in (gnu packages geeqie).

* gnu/packages/geeqie.scm: Import all of (gnu packages ghostscript) instead
  of selectively only the lcms variable; this helps resolve problems with
  circular dependencies when including the module.

gnu: libtiff: Update home page.

* gnu/packages/image.scm (libtiff)[home-page]: Update.

gnu: vigra: Add support for OpenEXR.

* gnu/packages/image.scm (vigra)[inputs]: Add ilmbase and openexr.
  [arguments]: Augment #:configure-flags.

gnu: Order module imports in (gnu packages photo) alphabetically.

* gnu/packages/photo.scm: Order module imports alphabetically.

gnu: Add prefix to license imports in (gnu packages photo).

* gnu/packages/photo.scm: Import (guix licenses) with #:prefix license: to
  avoid an impending clash with the import of zlib from both (guix licenses)
  and (gnu packages compression).

gnu: guix: Enable container tests.

* gnu/packages/package-management.scm (guix-devel): Delete
  'disable-container-tests' build phase.

gnu: Add 'patches'.

* gnu/packages/patchutils.scm (patches): New variables.

gnu: Add python2-notmuch.

* gnu/packages/mail.scm (python2-notmuch): New variable.

gnu: ath9k-htc-firmware: Update to 1.4.0.

* gnu/packages/firmware.scm (ath9k-htc-firmware): Update to 1.4.0.

gnu: Rename librest to rest.

* gnu/packages/gnome.scm (rest): Rename from librest.

gnu: r: Drop texlive from native-inputs.

* gnu/packages/statistics.scm (r)[native-inputs]: Remove "texlive".

gnu: r: Install info documentation.

* gnu/packages/statistics.scm (r)[arguments]: Add phases "make-info" and
  "install-info" to build and install info documentation.

gnu: r: Drop IcedTea from inputs.

* gnu/packages/statistics.scm (r)[inputs]: Remove "icedtea6".

gnu: magit: Update to 2.2.2.

* gnu/packages/emacs.scm (magit): Update to 2.2.2.

gnu: tinc: Use /etc as the sysconfdir, and /var as the localstatedir.

* gnu/packages/vpn.scm (tinc)[arguments]: New field.

gnu: Add r-ggplot2.

* gnu/packages/statistics.scm (r-ggplot2): New variable.