* gnu/packages/base.scm (hello): Update to 2.10.

* gnu/packages/ruby.scm (ruby): Update to version 2.1.5.

* gnu/packages/package-management.scm (guix-devel): Fix hash, which was
  wrongfully input in commit a0e59dd8.

* gnu/packages/xiph.scm (opus-tools): New variable.

Reported by John Darrington <john@darrington.wattle.id.au>.

* doc/guix.texi (Packaging Guidelines): Fix hydra.gnu.org URL.

* gnu/packages/linux.scm (linux-libre): Update to version 3.17.3.

* gnu/packages/games.scm (tiled): New variable.

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

Suggested by Alex Sassmannshausen <alex.sassmannshausen@gmail.com>.

* doc/guix.texi (Using the Configuration System): Remove 'password'
  field in the example.
  (User Accounts): Clarify use of the 'password' field, with links to
  the libc and Guile manuals.

* gnu/packages/package-management.scm (guix-devel): Update snapshot.

* gnu/services/base.scm (user-unmount-service): Add 'chdir' call.

* guix/build/syscalls.scm (remove-from-mtab): Replace "fstab" with
  "mtab".

* doc/guix.texi (Acknowledgments): Expound a bit.
* THANKS: Mention artwork; thank Felipe & Nikita.

* gnu/artwork.scm (%artwork-repository): Update.

* guix/scripts/substitute-binary.scm (guix-substitute-binary)<"--substitute">:
  Be slightly less verbose.

Fixes a regression introduced in c198872b.
Reported by John Darrington.

* gnu/packages/file.scm (file)[self-native-input?]: New field.

Suggested by Mark H Weaver.

* gnu/packages/version-control.scm (aegis): Use FILE-5.20 instead of FILE.
* gnu/packages/patchutils.scm (quilt): Likewise.

* gnu/packages/file.scm (file)[replacement]: Remove.
  (file/fixed): Remove.
  (file-5.20): New variable.

This reverts commit 9de1defe.

Passing #:graft? was not possible because of the use of 'cut' on call
sites.

* build-aux/hydra/gnu-system.scm (package->alist): Pass #:graft? #f to
  PACKAGE-DERIVATION.

Reported by nebuli on #guix.

* gnu/packages/admin.scm (net-base): Update to 5.3.

Reported by nebuli on #guix.

* gnu/packages/lsof.scm (%ftp-base): New variable.
  (lsof): Update to 4.88.  Add /OLD as alternate URL.

Reported by nebuli on #guix.

* gnu/build/vm.scm (initialize-partition-table): Add #:bootable?
  parameter and honor it.
  (initialize-hard-disk): Likewise.

Reported by nebuli on #guix.

* gnu/build/linux-boot.scm (make-disk-device-nodes): Make 16 block
  devices for disk partitions.

* gnu/packages/file.scm (file)[replacement]: New field.
  (file/fixed): New variable.

* guix/derivations.scm (graft-derivation): Use the term "grafting" in
  the build message.

* gnu/packages/file.scm (file)[description]: Fix typo.

Reported by th3kent on #guix.

* gnu/system/linux-initrd.scm (base-initrd)[linux-modules]: Add
  pata_acpi.ko and pata_atiixp.ko.

* gnu/packages/scheme.scm (chicken): Update to 4.9.0.1.

* gnu/packages/patches/gnutls-server-name-fix.patch: Remove.
* gnu-system.am (dist_patch_DATA): Adjust accordingly.
* gnu/packages/gnutls.scm (gnutls): Update to 3.2.20.
  Remove 'patches' field.

* gnu/packages/package-management.scm (guix-0.7)[native-inputs]: Add
  Emacs.

Fixes <http://bugs.gnu.org/18698>.
Reported by Mark H Weaver <mhw@netris.org>.

* gnu/packages/gnustep.scm (windowmaker)[arguments]: Add 'pre-configure'
  phase.  Change 'wrap' phase to wrap 'wmaker.inst', not 'wmaker'.

* gnu/services/xorg.scm (xinitrc): Set argv[0] when invoking ratpoison
  or wmaker.

Suggested by Ludovic Courtès.

* emacs/guix-info.el (guix-info-insert-methods, guix-info-displayed-params):
  Add 'source' parameter.
  (guix-package-info-source): New face.
  (guix-package-source): New button type.
  (guix-package-info-auto-find-source, guix-package-info-auto-download-source,
  guix-package-info-download-buffer): New variables.
  (guix-package-info-show-source, guix-package-info-insert-source-url,
  guix-package-info-insert-source, guix-package-info-download-source,
  guix-package-info-redisplay-after-download): New procedures.
* emacs/guix-base.el (guix-param-titles): Add 'source' parameter.
  (guix-operation-prompt): Add 'prompt' argument.
  (guix-after-source-download-hook): New variable.
  (guix-package-source-path, guix-package-source-build-derivation): New
  procedures.
* emacs/guix-main.scm (%package-param-alist): Add 'source' parameter.
  (package-source-names, package-source-derivation->store-path,
  package-source-path, package-source-build-derivation): New procedures.

* gnu/packages/games.scm (gtypist): New variable.

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

* gnu/artwork.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu/services/xorg.scm: Use it.
  (%artwork-repository): Remove.
* gnu/system/grub.scm: Use it.
  (%artwork-repository): Remove.

* gnu/services/xorg.scm (%artwork-repository, %default-slim-theme,
  %default-slim-theme-name): New variables.
  (slim-service): Add #:theme and #:theme-name parameters.
  [slim.cfg]: Honor #:theme-name.
  Honor #:theme by setting the "SLIM_THEMESDIR" environment variable.
* doc/guix.texi (X Window): Adjust 'slim-service' documentation
  accordingly.  Document '%default-slim-theme' and
  '%default-slim-theme-name'.

* build-aux/hydra/gnu-system.scm (qemu-jobs): Require 800 MiB for the
  USB disk image.