gnu: Use version-major+minor in gnome and gtk.

* gnu/packages/gnome.scm (gnome-desktop, gnome-doc-utils,
  libgnome-keyring, evince, gsettings-desktop-schemas,
  gnome-icon-theme, libnotify, lipeas, glade, libcroco, libgsf,
  librsvg, libidl, orbit2, gconf, gnome-mime-data, gnome-vfs,
  libgnome, libart-lgpl, libgnomecanvas, libgnomeui, libglade,
  libgnomeprint, libgnomeprintui, libbonoboui, goffice, gnumeric): Use
  version-major+minor.
  (shared-mime-info, hicolor-icon-theme): Wrap long uri lines.
* gnu/packages/gtk.scm (atk, pangox-compat, gtksourceview, gdk-pixbuf,
  at-spi2-core, at-spi2-atk, gtk+-2, gtk+, pangomm, atkmm, gtkmm,
  gtkmm-2): Use version-major+minor.

packages: 'package-transitive-supported-systems' accounts for indirect deps.

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

* guix/packages.scm (first-value): New macro.
  (package-transitive-supported-systems): Rewrite to traverse all the
  DAG rooted at PACKAGE.
* tests/packages.scm ("package-transitive-supported-systems"): Add 'd'
  and 'e', and test them.

gnu: Add Cython.

* gnu/packages/python.scm (cython, cython2): New variables.

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

gnu: man-pages: Build sequentially.

Fixes <http://bugs.gnu.org/18701>.
Reported by Mark H Weaver <mhw@netris.org>.

* gnu/packages/man.scm (man-pages)[arguments]: Add #:parallel-build? #f.

system: Allow Linux-libre to find our 'modprobe' command.

Fixes <http://bugs.gnu.org/18525>.
Reported by Mark H Weaver <mhw@netris.org>.

* gnu/build/activation.scm (activate-modprobe): New procedure.
* gnu/system.scm (modprobe-wrapper): New procedure.
  (operating-system-activation-script): Use both.

gnu: kmod: 'kmod static-nodes' command honors $LINUX_MODULE_DIRECTORY.

* gnu/packages/patches/kmod-module-directory.patch: Add hunk for
  tools/static-nodes.c.  Taken from Nixpkgs, where it was added by
  Eelco Dolstra <eelco.dolstra@logicblox.com>.

guix-register: Do not attempt to create NIX_STORE_DIR.

Fixes <http://bugs.gnu.org/18689>.
Reported by Philip Woods <elzairthesorcerer@gmail.com>.

* nix/guix-register/guix-register.cc (main): Move 'store' instantiation
  above 'settings.nixStore' assignment.

packages: Implement grafts.

Thanks to Mark H. Weaver <mhw@netris.org> for insightful discussions
and suggestions.

* guix/packages.scm (<package>)[graft]: New field.
  (patch-and-repack): Invoke 'package-derivation' with #:graft? #f.
  (package-source-derivation): Likewise.  Do not use (%guile-for-build)
  in call to 'patch-and-repack', and we could end up using a grafted
  Guile.
  (expand-input): Likewise, also for 'package-cross-derivation' call.
  (package->bag): Add #:graft? parameter.  Honor it.  Use 'strip-append'
  instead of 'package-full-name'.
  (input-graft, input-cross-graft, bag-grafts, package-grafts): New
  procedures.
  (package-derivation, package-cross-derivation): Add #:graft? parameter
  and honor it.
* gnu/packages/bootstrap.scm (package-with-bootstrap-guile): Add
  recursive call on 'graft'.
* guix/build-system/gnu.scm (package-with-explicit-inputs,
  package-with-extra-configure-variable, static-package): Likewise.
  (gnu-build): Use the ungrafted Guile to avoid full rebuilds.
  (gnu-cross-build): Likewise.
* guix/build-system/cmake.scm (cmake-build): Likewise.
* guix/build-system/glib-or-gtk.scm (glib-or-gtk-build): Likewise.
* guix/build-system/perl.scm (perl-build): Likewise.
* guix/build-system/python.scm (python-build): Likewise.
* guix/build-system/ruby.scm (ruby-build): Likewise.
* guix/build-system/trivial.scm (guile-for-build): Likewise.
* tests/packages.scm ("package-derivation, direct graft",
  "package-cross-derivation, direct graft", "package-grafts,
  indirect grafts", "package-grafts, indirect grafts, cross",
  "package-grafts, indirect grafts, propagated inputs",
  "package-derivation, indirect grafts"): New tests.
  ("bag->derivation", "bag->derivation, cross-compilation"): Wrap in
  'parameterize'.
* doc/guix.texi (Security Updates): New node.
  (Invoking guix build): Document --no-graft.

packages: Add 'package->bag' test for propagated inputs.

* tests/packages.scm ("package->bag, propagated inputs"): New test.

derivations: Add 'derivation-name'.

* guix/derivations.scm (derivation-name): New procedure.
* tests/derivations.scm ("derivation-name"): New test.

gnu: Add oxygen-icons.

* gnu/packages/kde.scm (oxygen-icons): New variable.

emacs: Add package info heading.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

* emacs/guix-info.el: (guix-package-info-heading): New face.
  (guix-package-info-synopsis): Modify face.
  (guix-info-insert-entry-default, guix-package-info-insert-heading,
  guix-package-info-insert-with-heading): New procedures.
  (guix-package-info-heading-params, guix-info-insert-package-function,
  guix-info-insert-installed-function, guix-info-insert-output-function,
  guix-info-insert-generation-function): New variables.

gnu: Add freeimage.

* gnu/packages/image.scm (freeimage): New variable.

gnu: libart-lgpl: Update to 2.3.21.

* gnu/packages/gnome.scm (libart-lgpl): Update to 2.3.21.

gnu: wget: Add input libpsl.

* gnu/packages/wget.scm (wget)[inputs]: Add libpsl.

gnu: Add libpsl.

* gnu/packages/web.scm (libpsl): New variable.

gnu: wget: Upgrade to 1.16.

* gnu/packages/wget.scm (wget)[source]: Upgrade to 1.16.
  [inputs]: Add libidn.
  [native-inputs]: Add python, perl-http-daemon, and
  perl-io-socket-ssl.

gnu: Add perl-io-socket-ssl.

* gnu/packages/web.scm (perl-io-socket-ssl): New variable.

gnu: Add perl-net-ssleay.

* gnu/packages/openssl.scm (perl-net-ssleay): New variable.

gnu: ruby: Update to 2.1.4.

* gnu/packages/ruby.scm: Update.  Remove the now redundant readline patch.