gnu: Add gnome-default-applications.

* gnu/packages/gnome.scm (gnome-default-applications): New public variable.
(gnome): Propagate gnome-default-applications so that nautilus is associated
with folders, not baobab.

gnu: gnome: Propagate font-dejavu.

* gnu/packages/gnome.scm (gnome): Add font-dejavu to propagated inputs, to
  provide a better default for "Monospace".  Otherwise the terminal looks
  horrible and defaults to Nimbus Mono, a Courier-like face.

gnu: gobby: Re-add Gobby 0.4.

* gnu/packages/gobby.scm (gobby-0.4): New variable.

gnu: gnome: Propagate more packages.

* gnu/packages/gnome.scm (gnome): Add additional dependencies, inspired by
  Debian's "gnome-core" package.

gnu: grub-efi-bootloader: Specialize grub-install invocation.

* gnu/bootloader/grub.scm (install-grub-efi): Fix grub-install invocation for
  EFI systems.
* gnu/system/examples/bare-bones.tmpl: Use the newer
"bootloader-configuration" syntax.
* gnu/system/examples/desktop.tmpl: Use bootloader-configuration sytax.  Also,
use the same label for the LUKS-mapped device and the root partition.  Remove
unneeded "title" field for the file-system based on LUKS; as noted in the
manual, the "title" field is ignored for mapped devices.
* gnu/system/examples/lightweight-desktop.tmpl: Use bootloader-configuration,
and use grub-efi-bootloader.

gnu: gobby: Update to 0.5.0.

* gnu/packages/gobby.scm (gobby): Update to 0.5.0.
[inputs]: Remove libnet6 and obby. Add libinfinity. Sort.
[arguments]: Add move-executable phase.

gnu: Add libinfinity.

* gnu/packages/gobby.scm (libinfinity): New variable.

gnu: icedtea@3: Update to 3.5.1.

* gnu/packages/java.scm (icedtea-8): Update to 3.5.1.

gnu: icedtea@2: Update to 2.6.11 [security fixes].

Fixes CVE-2017-{10053,10067,10074,10081,10087,10089,10090,10096,10101,10102,
10107,10108,10109,10110,10111,10115,10116,10118,10135,10074,10176}.

* gnu/packages/java.scm (icedtea-7): Update to 2.6.11.

gnu: libreoffice: Update to 5.3.5.2.

* gnu/packages/libreoffice.scm (libreoffice): Update to 5.3.5.2.

pack: Add "none" compressor.

* guix/scripts/pack.scm (%compressors): Add compressor "none"; prepend
extension with ".".
(self-contained-tarball, docker-image): Assume compressor extensions start
with period.
* doc/guix.texi (Invoking guix pack): Document it.

doc: Update Database services in detailed node list.

This was updated in the Service subsection, but the matching update here was
missed.

* doc/guix.text (Top): Change database services description.

doc: Mention how to use emacs-debbugs.

* HACKING (Using emacs-debbugs): Add section on using emacs-debbugs.

maint: Create an ISO9660 installation image in the 'release' target.

* Makefile.am (GUIXSD_IMAGE_BASE): Adapt target file name.
(release): Use file-system-type iso9660.
* doc/guix.texi: Document installation from DVD.

gnu: python-netaddr: Update to 0.7.19.

* gnu/packages/python.scm (python-netaddr): Update to 0.7.19.

gnu: lz4: Update to 1.8.0.

* gnu/packages/compression.scm (lz4): Update to 1.8.0.  Fix typo in comment.
[source]: Remove patch.
* gnu/packages/patches/lz4-fix-test-failures.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Remove it.

gnu: lz4: Use recommended home page.

* gnu/packages/compression.scm (lz4)[home-page]: Use lz4.org.

gnu: Remove libgames-support.

It was simply the old name (and version) of libgnome-games-support.

* gnu/packages/gnome.scm (libgames-support): Remove variable.  Move the
inherited fields...
(libgnome-games-support): ...to here.

gnu: newsbeuter: Fix CVE-2017-12904.

* gnu/packages/patches/newsbeuter-CVE-2017-12904.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/syndication.scm (newsbeuter)[source]: Use it.

gnu: python-pygit2: Update to 0.26.0.

* gnu/packages/python.scm (python-pygit2): Update to 0.26.0.
* gnu/packages/patches/python-pygit2-disable-network-tests.patch: Skip one
more test. Use unittest.skipIf instead of deleting sections.