gnu: expat: Add fix for CVE-2015-1283.

* gnu/packages/patches/expat-CVE-2015-1283.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/xml.scm (expat)[source]: Add patch.

Merge branch 'master' into core-updates

gnu packages: Avoid description lines with leading "(".

* gnu/packages/curl.scm (curl): Reformat description to avoid a line
  beginning with "(" because such lines break font-lock highlighting
  in Emacs.
* gnu/packages/flashing-tools.scm (dfu-programmer): Likewise.
* gnu/packages/games.scm (gnugo): Likewise.
* gnu/packages/gnome.scm (json-glib): Likewise.
* gnu/packages/image.scm (jbig2dec): Likewise.
* gnu/packages/maths.scm (units): Likewise.
* gnu/packages/pdf.scm (mupdf): Likewise.
* gnu/packages/web.scm (perl-encode-locale): Likewise.
* gnu/packages/wordnet.scm (wordnet): Likewise.
* gnu/packages/xml.scm (libxml2):Likewise.

gnu: Rename module gnutls to tls.

* gnu/packages/gnutls.scm: Rename to...
* gnu/packages/tls.scm: ... this.  Change module name accordingly.
* gnu/packages/{admin.scm, cups.scm, curl.scm, dc.scm, dns.scm, emacs.scm,
  ftp.scm, gnome.scm, gnunet.scm, gnupg.scm, gsasl.scm, lynx.scm,
  mail.scm, messaging.scm, package-management.scm, shishi.scm,
  task-management.scm, version-control.scm, video.scm, vpn.scm,
  webkit.scm, weechat.scm, wget.scm, wine.scm, xml.scm}: Adapt module
  import to new name.
* gnu-system.am (GNU_SYSTEM_MODULES): Rename gnutls module to tls.

Merge branch 'master' into core-updates

Conflicts:
	gnu/packages/commencement.scm
	gnu/packages/xml.scm

gnu: Add pugixml.

* gnu/packages/xml.scm (pugixml): New variable.

Merge branch 'master' into core-updates

gnu: libxml2: Build python bindings separately.

* gnu/packages/xml.scm (libxml2)[native-inputs]: Remove python.
  [arguments]: Remove.
  (python-libxml2, python2-libxml2): New variables.

gnu: libxml2: Update to 2.9.2.

* gnu/packages/xml.scm (libxml2): Update to 2.9.2.

gnu: Add xmlsec.

* gnu/packages/xml.scm (xmlsec): New variable.

Merge branch 'master' into gtk-rebuild

Conflicts:
	gnu/packages/gtk.scm

gnu: Adjust latest perl modules to new 'modify-phases' syntax.

* gnu/packages/compression.scm (perl-compress-raw-zlib)[arguments]:
  Add missing quotes, as needed since commit f8503e2.
* gnu/packages/perl.scm (perl-ipc-run)[arguments]: Likewise.
* gnu/packages/xml.scm (perl-xml-sax)[arguments]: Likewise.

gnu: Add XML-LibXML.

* gnu/packages/xml.scm (perl-xml-libxml): New variable.

gnu: Add XML-SAX;

* gnu/packages/xml.scm (perl-xml-sax): New variable.

gnu: Add XML-SAX-Base.

* gnu/packages/xml.scm (perl-xml-sax-base): New variable.

gnu: Add XML-NamespaceSupport.

* gnu/packages/xml.scm (perl-xml-namespacesupport): New variable.

Merge branch 'core-updates'.

gnu: libxml2: Propagate input zlib.

* gnu/packages/xml.scm (libxml2): Move zlib to 'propagated-inputs'.

Merge branch 'core-updates'

Conflicts:
	gnu/packages/bootstrap.scm

Merge branch 'master' into core-updates