doc: Make 'guix publish' more visible.

* doc/guix.texi (Substitutes): Add xref to "Invoking guix publish".
  (Invoking guix publish): Add xref to "Substitutes".  Explain what
  Hydra is.

doc: "GSD" -> "GuixSD".

* doc/guix.texi: Replace "GSD" with "GuixSD".

doc: Use @indicateurl where appropriate.

* doc/guix.texi (Binary Installation, Invoking guix-daemon, System
  Installation): Use @indicateurl instead of @code where appropriate.

install: desktop.tmpl: Add "netdev" to the user's supplementary groups.

* gnu/system/examples/desktop.tmpl: Add "netdev" to the user's supplementary
  groups.

doc: Document X.509 certificates.

* doc/guix.texi (Using the Configuration System): Add xref to "X.509
  Certificates".
  (X.509 Certificates): New section.
* gnu/system/examples/desktop.tmpl: Use NSS-CERTS.

daemon: Fix possible use-after-free.

This is essentially a backport of
<https://github.com/NixOS/nix/commit/f52b6c944e90b3e35925122779175705fdc02e12>
by Eelco Dolstra <eelco.dolstra@logicblox.com>.

The use-after-free bug would typically manifest when building with
GCC 5.1.

gnu: Add MyThes.

* gnu/packages/libreoffice.scm (mythes): New variable.

gnu: Add hyphen.

* gnu/packages/libreoffice.scm (hyphen): New variable.

gnu: Add hunspell.

* gnu/packages/libreoffice.scm (hunspell): New variable.

gnu: ardour: Extract RUNPATH phase.

* gnu/packages/audio.scm (ardour-rpath-phase): New procedure.
* gnu/packages/audio.scm (ardour, ardour-3): Generate version-dependent build
  phase with ardour-rpath-phase.

gnu: wpa-supplicant: Add security fixes.

* gnu/packages/patches/wpa-supplicant-2015-2-fix.patch,
  gnu/packages/patches/wpa-supplicant-2015-3-fix.patch,
  gnu/packages/patches/wpa-supplicant-2015-4-fix-pt1.patch,
  gnu/packages/patches/wpa-supplicant-2015-4-fix-pt2.patch,
  gnu/packages/patches/wpa-supplicant-2015-4-fix-pt3.patch,
  gnu/packages/patches/wpa-supplicant-2015-4-fix-pt4.patch,
  gnu/packages/patches/wpa-supplicant-2015-4-fix-pt5.patch: New files.
* gnu-system.am (dist_patch_DATA): Add them.
* gnu/packages/admin.scm (wpa-supplicant-light)[source]: Add patches.

gnu: octave: Add fftw, arpack, and glu inputs.

* gnu/packages/maths.scm (octave)[inputs]: Add fftw, fftwf, arpack,
  and glu.
  [description]: Wrap to 80 columns.

build: check-final-inputs-self-contained uses %HYDRA-SUPPORTED-SYSTEMS.

* build-aux/check-final-inputs-self-contained.scm: Change
  '%supported-systems' to '%hydra-supported-systems'.

nls: Add package files for translation.

* po/packages/POTFILES.in: Add a bunch of files.

gnu: libcdio: Synchronize description.

* gnu/packages/cdrom.scm (libcdio)[description]: Synchronize with GNU.

gnu: libtasn1: Update to 4.5.

* gnu/packages/gnutls.scm (libtasn1): Update to 4.5.

gnu: Add tvtime.

* gnu/packages/tv.scm,
  gnu/packages/patches/tvtime-gcc41.patch,
  gnu/packages/patches/tvtime-pngoutput.patch,
  gnu/packages/patches/tvtime-videodev2.patch,
  gnu/packages/patches/tvtime-xmltv.patch: New files.
* gnu-system.am (GNU_SYSTEM_MODULES): Add package.
  (dist_patch_DATA): Add patches.

doc: Mention GNU Make as a requirement.

* README (Requirements): Add GNU Make.
* doc/guix.texi (Requirements): Likewise.

http-client: Remove monkey patching for 2.0.5.

* guix/http-client.scm (read-response-body*): Remove.
  (http-fetch): Remove hacks for 2.0.5.

Remove assorted Guile 2.0.5 workarounds.

* guix/scripts/authenticate.scm (%default-port-conversion-strategy):
  Remove.
* guix/scripts/substitute.scm (fetch): Remove 2.0.5 special cases.
* guix/serialization.scm (write-file): Remove 'scandir' workaround.
* guix/ui.scm (command-files): Likewise.