* gnu/services.scm (compute-boot-script): Add first placeholder
  parameter.
  (boot-service-type): Change 'compose' to APPEND, and 'extend' to
  COMPUTE-BOOT-SCRIPT.

* gnu/packages/maths.scm (gsl)[arguments]: Enable tests for i686-linux.

* gnu/packages/maths.scm (gsl): Update to 2.0.
  [source]: Remove patches.
* gnu/packages/patches/gsl-poly-test-fix-pt1.patch,
  gnu/packages/patches/gsl-poly-test-fix-pt2.patch: Remove files.
* gnu-system.am (dist_patch_DATA): Remove patches.

* doc/guix.texi (Invoking guix environment): Fix typos.

* gnu/packages/ruby.scm (ruby-permutation): New variable.

* gnu/packages/ruby.scm (ruby-listen): New variable.

* gnu/packages/ruby.scm (ruby-rb-inotify): New variable.

* gnu/packages/ruby.scm (ruby-simplecov-html): New variable.

* gnu/packages/ruby.scm (ruby-ffi): New variable.

* gnu/packages/ruby.scm (ruby-rubygems-tasks): New variable.

* gnu/packages/bioinformatics.scm (hisat)[supported-systems]: Add field.

* guix/scripts/environment.scm (%default-options): Remove 'exec'
  association.
  (guix-environment): If the user didn't specify a command, use the
  default shell, or use /bin/sh when a container is requested.

* gnu/packages/python.scm (python-simplegeneric)[native-inputs]: Add
  python-setuptools.

* gnu/packages/machine-learning.scm (shogun)[supported-systems]: Add
  field.

* doc/guix.texi (Invoking guix container): Fix typo.

* emacs/guix-build-log.el (guix-build-log-minor-mode-activate): New variable.
  (guix-build-log-minor-mode-activate-maybe): New function.
* emacs/guix-init.el: Add it to 'shell-mode-hook'.
* doc/emacs.texi (Emacs Build Log): Mention it.

* emacs/guix-build-log.el (auto-mode-alist): Add 'guix-build-log-mode'
  to 'auto-mode-alist'.

* guix/scripts/refresh.scm: Export '%updaters'.
* emacs/guix-main.scm (refresh-updater-names): New procedure.
* emacs/guix-base.el (guix-refresh-updater-names): New function.
* emacs/guix-read.el (guix-read-refresh-updater-names,
  guix-read-refresh-updater-names-string): New functions.
* emacs/guix-command.el (guix-command-improve-refresh-argument): Use
  'guix-read-refresh-updater-names-string'.

* gnu/packages/mail.scm (claws-mail): Update to 3.13.0.
  [url]: Update to new location.

* gnu/packages/bioinformatics.scm (express-beta-diversity): New variable.

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

* gnu/system/grub.scm (grub-background-image): Increase the default
  values of WIDTH and HEIGHT.  After all, it's 2015 already!

* gnu/packages/links.scm (links)[inputs]: Add libevent.

* gnu/packages/links.scm (links): Update to 2.12.
  Various whitespace and line length fixes.

* guix/scripts/container.scm: New file.
* guix/scripts/container/exec.scm: New file.
* po/guix/POTFILES.in: Add them.
* Makefile.am (MODULES): Add them.
* doc/guix.texi (Invoking guix container): New section.

* gnu/packages/synergy.scm (synergy): Upgrade to 1.7.4.

* doc/guix.texi ("invoking guix environment", "invoking guix system"):
  Mention Linux-libre requirements for container features.

* gnu/system/examples/desktop.tmpl: Add 'mapped-devices' field.
  Use it in 'file-systems'.
* doc/guix.texi (System Installation): Suggest encrypted partitions.
  Give an example of a command sequence.

Fixes <http://bugs.gnu.org/21784>.

* gnu/packages/compression.scm (xz)[source]: Add alternate URL.

This reverts commit 7f39e181.

Polkit actually uses the name "polkit-1" in calls to 'pam_start'.

* gnu/packages/video.scm (youtube-dl)[url]: Change to http.
  [description]: Fix capitalization.

* gnu/packages/video.scm (youtube-dl): Update to 2015.11.01.

* gnu/services/desktop.scm (<udisks-configuration>): New record type.
  (udisks-service-type): New variable.
  (udisks-service): New procedure.
  (%desktop-services): Use it.
* doc/guix.texi (Desktop Services): Document it.

* gnu/packages/freedesktop.scm (udisks)[outputs]: New field.
  [arguments]: Pass the --with-html-dir configure flag.

* gnu/packages/freedesktop.scm (udisks)[arguments]: Add
  --enable-fhs-media.

* gnu/packages/freedesktop.scm (udisks)[inputs]: Add UTIL-LINUX.
  [arguments]: Add 'set-mount-file-name' phase.

* gnu/packages/polkit.scm (polkit)[source]: Adjust snippet so that rules
  and actions are looked for under /etc/polkit-1.
* gnu/services/desktop.scm (<polkit-configuration>): New record type.
  (polkit-directory, polkit-etc-files, polkit-setuid-programs): New
  procedures.
  (polkit-service-type)[compose, extend]: New fields.
  (polkit-service): Refine docstring.
  (colord-service-type): Extend POLKIT-SERVICE-TYPE.
  (elogind-configuration-file): Extend POLKIT-SERVICE-TYPE.
* doc/guix.texi (Desktop Services): Update 'polkit-service'
  documentation.

* gnu/packages/hurd.scm (hurd-headers): Update to version 0.7.

* gnu/packages/hurd.scm (mig): Update to version 1.6.