gnu: texinfo: Make version 4.13a available.

* gnu/packages/texinfo.scm (texinfo-4): New variable.

gnu: gnunet: Add input libmicrohttpd.

* gnu/packages/gnunet.scm (gnunet): Add input libmicrohttpd and improve
    formatting.

store: Change 'export-paths' to always export in topological order.

* guix/store.scm (export-paths): Pass PATHS through
  'topologically-sorted' before iterating.
* tests/store.scm ("export/import paths, ensure topological order"): New
  test.

gnu: lout: Change docdir from "doc" to "share/doc"

* gnu/packages/lout.scm (lout):
  Change docdir from "doc" to "share/doc".

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: Add GNUnet.

* gnunet/packages/gnunet.scm (gnunet): New variable.
* gnu/package/patches/gnunet-fix-scheduler.patch: New file.
* gnu/package/patches/gnunet-fix-tests.patch: New file.
* gnu-system.am (dist_patch_DATA): Add the above two patch files.

Co-authored-by: Andreas Enge <andreas@enge.fr>
Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: gstreamer 1.0.10: Temporarily disable tests.

* gnu/packages/gstreamer.scm (gstreamer): Add 'arguments' field.

gnu: openssh: Upgrade to 6.5p1.

* gnu/packages/ssh.scm (openssh): Upgrade to 6.5p1.

gnu: openssl: Upgrade to 1.0.1f.

* gnu/packages/openssl.scm (openssl): Upgrade to 1.0.1f.

union: Do not compare directories upon collision.

* guix/build/union.scm (file=?): Return #f if FILE1 and FILE2 are not
  regular files.  Fixes a bug whereby collisions among directories would
  lead to the invocation of 'file=?' and thus 'call-with-input-file' on
  directories.  Reported by Mark H. Weaver <mhw@netris.org>.

download: Provide a 'User-Agent' field in HTTP requests.

Fixes <http://bugs.gnu.org/16703>.
Reported by Raimon Grau <raimonster@gmail.com>.

* guix/build/download.scm (http-fetch)[headers]: New variable.
  Pass it as #:headers or #:extra-headers to 'http-get' and
  'http-get*'.

gnu: dmd: Add SLiM service.

* gnu/system/dmd.scm (xorg-service): Remove.
  (xorg-start-command, slim-service): New procedure.

gnu: dmd: Fix X font directory name in X service.

* gnu/system/dmd.scm (xorg-service)[xserver.conf]: Fix directory name in
  'FontPath' entry for FONT-ADOBE75DPI.

gnu: linux-initrd: When booting, chdir to the new root before calling 'chroot'.

* guix/build/linux-initrd.scm (boot-system): Add 'chdir' call right
  before 'chroot'.

gnu: slim: Work around flaky synchronization with the X server.

* gnu/packages/patches/slim-sigusr1.patch: New file.
* gnu/packages/slim.scm (slim): Use it.
* gnu-system.am (dist_patch_DATA): Add it.

gnu: Add stalonetray

* gnu/packages/stalonetray.scm: New file
* gnu-system.am (GNU_SYSTEM_MODULES): Add stalonetray.scm

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: moe: New module

* gnu/packages/moe.scm: New file
* gnu-system.am (GNU_SYSTEM_MODULES): Add moe.scm

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: Add FUSE.

* gnu/packages/linux.scm (fuse): New variable.

gnu: Move root's home directory to /root.

* gnu/system.scm (operating-system-derivation): Change root's
  'home-directory' to "/root".
* gnu/system/vm.scm (operating-system-default-contents): Add /root.

gnu: python-pysqlite: Point to the latest release tarball.

* gnu/packages/python.scm (python2-pysqlite): Change 'version' to
  "2.6.3a".  Change 'uri' to point to pypi.python.org.
  Reported by Mark H Weaver <mhw@netris.org> and others.
  Update 'home-page' and 'synopsis'.

gnu: Add paperkey.

* gnu/packages/gnupg.scm (paperkey): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>