gnu: libgcrypt: Update to 1.5.3

* gnu/packages/gnupg.scm (libgcrypt): Update to 1.5.3.

gnu: gnupg: Update to 2.0.21.

* gnu/packages/gnupg.scm (gnupg): Update to 2.0.21.

gnu: pspp: Update to 0.8.1.

* gnu/packages/maths.scm (pspp): Update to 0.8.1.

gnu: fontconfig: Add and register gs-fonts.

* gnu/packages/fontutils.scm (fontconfig): Add gs-fonts as an input and
    register it in the configuration file; so any porgram using fontconfig
    should at least have the gs-fonts at its disposal.

gnu: guix: Rework 0.4 hack to gracefully handle lack of tarball.

* gnu/packages/package-management.scm (guix-0.4): Fall back to the
  source of GIUX when the tarball doesn't exist.

gnu: vm: Add a service for the Guix daemon.

* gnu/system/dmd.scm (guix-service): New procedure.
* gnu/system/vm.scm (system-qemu-image): Use it.

gnu: vm: Initialize the image's store.

* gnu/system/vm.scm (qemu-image): Add 'initialize-store?' keyword
  parameter.  Use 'guix-register' when INITIALIZE-STORE? is true.
  (system-qemu-image): Pass #:initialize-store? #t.

gnu: guix: Set $localstatedir; add gzip as input.

* gnu/packages/package-management.scm (guix): Add "--localstatedir=/var".
  Add GZIP as an explicit input, to avoid referring to the final gzip.

guix-register: Allow the initial directory creation to proceed.

This fixes a bug whereby 'guix-register' would bail out when trying to
create NIX_STORE_DIR/.links when NIX_STORE_DIR is read-only.

* nix/guix-register/guix-register.cc (parse_opt): Initialize
  'settings.nixStore' to PREFIX + NIX_STORE_DIR.
  (main): Change 'settings.nixStore' once the 'LocalStore' has been
  instantiated.

gnu: racket: Add dependency on GTK+.

* gnu/packages/scheme.scm (racket): Add dependency on GTK+ and
  gdk-pixbuf.

gnu: xorg: Fix xorg-server.

* gnu/packages/xorg.scm (xkbcomp-intermediate): New variable, serves as
    input to xkeyboard-config.
* gnu/packages/xorg.scm (xkeyboard-config): Add input xkbcomp-intermediate.
* gnu/packages/xorg.scm (xkbcomp): Add input xkeyboard-config.
* gnu/packages/xorg.scm (xorg-server): Adapt xkb paths and replace references
    to /bin/sh (with Ludovic Courtès <ludo@gnu.org>).

guix-register: Expect closures to refer to the original store.

* nix/guix-register/guix-register.cc (prefix): New variable.
  (parse_opt): Use it.
  (register_validity): Change 'info.path' to the final store name.
  Hash the final under its real path.
* tests/guix-register.sh: Adjust the contents of $closure accordingly.
  Rename 'NIX_LOCALSTATE_DIR' to 'NIX_STATE_DIR'.  Don't try to call
  'valid-path?'.  Add test using 'sqlite3'.

list-packages: Progressive Enhancement approach to JS.

* build-aux/list-packages.scm (package->sxml): Add parameters previous,
  description-ids and remaining, update docstring accordingly. Introduce logic
  for fold-values process.
  (insert-tr): Moved sxml package table-row generation to new function; remove
  <a> elements and JS function calls. These are created through JS
  (prep_pkg_descs). Add insert-js-call for every 15th package, and the last.
  (insert-js-call): New function.
  (packages->sxml): Change map to fold values; add init params.
  (insert-js): show_hide: add compatibility check, introduce, use thingLink
               prep: new JS function.
               bulk_show_hide: new JS function.

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

gnu: mutt: Add SASL for authenticated SMTP.

* gnu/packages/mail.scm (mutt): Add input cyrus-sasl.

build: check-available-binaries: Adjust to derivation API change.

* build-aux/check-available-binaries.scm: Use 'derivation->output-path'
  instead of 'derivation-path->output-path'.

nar: Fix file descriptor leak when writing a Nar.

* guix/nar.scm (write-contents)[call-with-binary-input-file]: Always
  close PORT.

doc: Document '--list-generations' among the query options.

* doc/guix.texi (Invoking guix package): Move '--list-generations' below
  "In addition to these actions".

guix package: Show most recently installed packages last.

Suggested by Andreas Enge <andreas@enge.fr>.

* guix/scripts/package.scm (guix-package)[list-generations,
  list-installed]: Reverse the result of 'manifest-packages'.
* doc/guix.texi (Invoking guix package): Document the order of packages
  for '--list-generations' and '--list-installed'.

Add 'guix-register'.

* nix/guix-register/guix-register.cc, tests/guix-register.sh: New
  files.
* Makefile.am (SH_TESTS)[BUILD_DAEMON]: Add tests/guix-register.sh.
* daemon.am (sbin_PROGRAMS, guix_register_SOURCES,
  guix_register_CPPFLAGS, guix_register_LDADD): New variables.
* test-env.in: Export 'storedir', 'prefix', 'datarootdir', 'datadir',
  and 'localstatedir'.

build: Build the daemon with -Wall.

* daemon.am (AM_CXXFLAGS): New variable.