gnu: Add ghc-test-framework-hunit.

* gnu/packages/haskell.scm (ghc-test-framework-hunit): New variable.

gnu: Add ghc-test-framework.

* gnu/packages/haskell.scm (ghc-test-framework): New variable.

gnu: Add ghc-libxml.

* gnu/packages/haskell.scm (ghc-libxml): New variable.

gnu: Add ghc-hostname.

* gnu/packages/haskell.scm (ghc-hostname): New variable.

gnu: tilda: Update to 1.3.0.

* gnu/packages/terminals.scm (tilda): Update to 1.3.0.
[inputs]: Switch vte from 0.36 to 0.40, remove zip.

gnu: youtube-dl: Update to 2015.11.18.

* gnu/packages/video.scm (youtube-dl): Update to 2015.11.18.

gnu: libsndfile: Add fixes for CVE-2014-9496 and CVE-2015-7805.

* gnu/packages/patches/libsndfile-CVE-2014-9496.patch,
  gnu/packages/patches/libsndfile-CVE-2015-7805.patch: New files.
* gnu-system.am (dist_patch_DATA): Add them.
* gnu/packages/pulseaudio.scm (libsndfile)[source]: Add patches.

gnu: libxslt: Add fix for CVE-2015-7995.

* gnu/packages/patches/libxslt-CVE-2015-7995.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/xml.scm (libxslt)[source]: Add patch.

gnu: libxml2: Add fixes for CVE-2015-{1819,7941,7942,8035} and other bugs.

* gnu/packages/patches/libxml2-CVE-2015-1819.patch,
  gnu/packages/patches/libxml2-CVE-2015-7941-pt1.patch,
  gnu/packages/patches/libxml2-CVE-2015-7941-pt2.patch,
  gnu/packages/patches/libxml2-CVE-2015-7942-pt1.patch,
  gnu/packages/patches/libxml2-CVE-2015-7942-pt2.patch,
  gnu/packages/patches/libxml2-CVE-2015-8035.patch,
  gnu/packages/patches/libxml2-bug-737840.patch,
  gnu/packages/patches/libxml2-bug-738805.patch,
  gnu/packages/patches/libxml2-bug-746048.patch,
  gnu/packages/patches/libxml2-bug-747437.patch,
  gnu/packages/patches/libxml2-bug-751603.patch,
  gnu/packages/patches/libxml2-bug-751631.patch,
  gnu/packages/patches/libxml2-bug-754946.patch,
  gnu/packages/patches/libxml2-bug-754947.patch,
  gnu/packages/patches/libxml2-bug-755857.patch,
  gnu/packages/patches/libxml2-fix-catalog-corruption.patch,
  gnu/packages/patches/libxml2-id-attrs-in-xmlSetTreeDoc.patch,
  gnu/packages/patches/libxml2-node-sort-order-pt1.patch,
  gnu/packages/patches/libxml2-node-sort-order-pt2.patch: New files.
* gnu-system.am (dist_patch_DATA): Add them.
* gnu/packages/xml.scm (libxml2)[source]: Add patches.

gnu: libpng: Update to 1.5.24 [fixes CVE-2015-8126].

* gnu/packages/image.scm (libpng): Update to 1.5.24.

Revert "gnu: libpng: Use 1.5.24 as a replacement [fixes CVE-2015-8126]."

This reverts commit 1b076e630f4a7245d14634b047e1d1a91ee2659e.

services: Export udev-configuration procedures.

* gnu/services/base.scm (udev-configuration, udev-configuration?,
  udev-configuration-rules): Export.

gnu: weechat: Fix patching of assignments to 'python2_bin'.

Fixes a regression introduced in a9346fa.

* gnu/packages/weechat.scm (weechat)[arguments]: Make sure PYTHON2_BIN
  can be freed with 'free'.

gnu: weechat: Encode as UTF-8.

* gnu/packages/weechat.scm: Reencode as UTF-8.

gnu: weechat: Record the absolute file name of 'python'.

Fixes <http://bugs.gnu.org/21879>.
Reported by Luis Felipe López Acevedo <felipe.lopez@openmailbox.org>.

* gnu/packages/weechat.scm (weechat)[arguments]: Add
  'set-python-file-name' phase.

gnu: weechat: Use 'modify-phases'.

* gnu/packages/weechat.scm (weechat)[arguments]: Use 'modify-phases'.
  Remove 'fix-file' phase.

gnu: python-tornado: Use the preferred home-page.

* gnu/packages/python.scm (python-tornado)[home-page]: Use the preferred
  one.

gnu: python-cryptography: Update to 1.0.2.

* gnu/packages/python.scm (python-cryptography): Update to 1.0.2.

gnu: python-cryptography-vectors: Update to 1.0.2.

* gnu/packages/python.scm (python-cryptography-vectors): Update to 1.0.2.

gnu: zynaddsubfx: Update to 2.5.2.

* gnu/packages/music.scm (zynaddsubfx): Update to 2.5.2.