nls: Update 'da' translation.

gnu: xz: Add alternate URL.

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

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

Revert "services: polkit: Use the right executable name for PAM."

This reverts commit 7f39e181dfb34db8f245f3ffafe34eec9cee910d.

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

gnu: youtube-dl: Minor fixes.

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

gnu: youtube-dl: Update to 2015.11.01.

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

services: Add 'udisks-service'.

* 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: udisks: Separate HTML documentation.

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

gnu: udisks: Mount things under /media.

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

gnu: udisks: Find the 'mount' command.

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

services: 'polkit-service-type' can now be extended.

* 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: hurd-headers: Update to 0.7

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

gnu: mig: Update to 1.6

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

gnu: gnumach-headers: Update to 1.6

* gnu/packages/hurd.scm (gnumach-headers): Update to version 1.6.

tests: Make sure the daemon dumps directory entries deterministically.

* tests/store.scm ("write-file & export-path yield the same result"):
  New test.

doc: Suggest diffing things with --no-dereference.

* doc/guix.texi (Invoking guix challenge): Add --no-dereference in
  'diff' example.

Remove unneeded HAVE_UNSHARE.

* src/libstore/build.cc (CHROOT_ENABLED): Remove HAVE_UNSHARE.

gnu: Remove aarddict.

* gnu/packages/aarddict.scm: Remove file.
* gnu-system.am (GNU_SYSTEM_MODULES): Unregister file.

emacs: Disable minor modes in 'guix-build-log-mode'.

* emacs/guix-build-log.el (guix-build-log-mode-hook): Remove
  'compilation-shell-minor-mode' as it is slow on big buffers, and
  'view-mode' as it rebinds too many keys.
  (guix-build-log-mode-map): Add "c" and "v" key bindings for the
  removed minor modes.

emacs: Add key bindings for 'guix-build-log-minor-mode'.

* emacs/guix-build-log.el (guix-build-log-mode-map): Move keys to ...
  (guix-build-log-common-map): ...here.  New variable.
  (guix-build-log-minor-mode-map): New variable.
  (guix-build-log-minor-mode): Use it.
* doc/emacs.texi (Emacs Build Log): Document it.

guix system: Fix typo in --help message.

* guix/scripts/system.scm (show-help): Align 'container' the same way as
  other actions.