gnu: Add evolution-data-server.

* gnu/packages/gnome.scm (evolution-data-server): New variable.

gnu: Add gnome-online-accounts.

* gnu/packages/gnome.scm (gnome-online-accounts): New variable.

gnu: lua: Register patch.

* gnu-system.am (dist_patch_DATA): Register lua52-liblua-so.patch.

This is a follow-up to commit 0f9c1f34000e7fd3f4c6bdb45c568f6416906c3b.

gnu: stow: Update to 2.2.2.

* gnu/packages/package-management.scm (stow): Update to 2.2.2.
  [native-inputs]: Add PERL-IO-STRINGY.

gnu: libmicrohttpd: Update to 0.9.46.

* gnu/packages/gnunet.scm (libmicrohttpd): Update to 0.9.46.

guix gc: Error out when extra arguments are passed.

Fixes <http://bugs.gnu.org/21817>.
Reported by Petter Berntsen <petter@mykolab.ch>.

* guix/scripts/gc.scm (guix-gc)[assert-no-extra-arguments]: New
  procedure.
  Use it for actions 'collect-garbage', 'optimize', and 'verify'.
* tests/guix-gc.sh: Add tests.

edit: Honor $VISUAL.

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

* guix/scripts/edit.scm (%editor): Honor 'VISUAL' before 'EDITOR'.
  (show-help): Adjust accordingly.
* doc/guix.texi (Invoking guix edit): Likewise.

gnu: Add microscheme.

* gnu/packages/avr.scm (microscheme): New variable.

refresh: Avoid non-literal format string.

Reported by Mathieu Lirzin <mthl@gnu.org>.

* guix/scripts/refresh.scm (guix-refresh): Rewrite 'list-dependent?'
  report to avoid nested 'N_' calls.

gnu: Add prefix to license imports in (gnu packages avr).

* gnu/packages/avr.scm: Import (guix licenses) with prefix "license:".

gnu: ardour: Update to 4.4.

* gnu/packages/audio.scm (ardour): Update to 4.4.

gnu: Add gfortran 5.

* gnu/packages/gcc.scm (gfortran-5): New variable.

gnu: wpa-supplicant: Add fixes for CVE-2015-{5310,5314,5315,5316}.

* gnu/packages/patches/wpa-supplicant-CVE-2015-5310.patch,
  gnu/packages/patches/wpa-supplicant-CVE-2015-5314.patch,
  gnu/packages/patches/wpa-supplicant-CVE-2015-5315.patch,
  gnu/packages/patches/wpa-supplicant-CVE-2015-5316.patch: New files.
* gnu-system.am (dist_patch_DATA): Add them.
* gnu/packages/admin.scm (wpa-supplicant-minimal)[source]: Add patches.

gnu: youtube-dl: Upgrade to 2015.11.10.

* gnu/packages/video.scm (youtube-dl): Upgrade to 2015.11.10.

gnu: linux-libre: Update to 4.2.6.

* gnu/packages/linux.scm (linux-libre): Update to 4.2.6.

gnu: git: Update to 2.6.3.

* gnu/packages/version-control.scm (git): Update to 2.6.3.
  (git-manpages)[source]: Update hash.

ui: 'guix help COMMAND' is like 'guix COMMAND --help'.

* guix/ui.scm (run-guix): Add ("help" COMMAND) case.

guix package: '--search-paths' can report combined search paths.

Partly fixes <http://bugs.gnu.org/20255>.

* guix/scripts/package.scm (search-path-environment-variables): Change
  'profile' to 'profiles'; expect it to be a list.
  (display-search-paths): Likewise.
  (%default-options): Remove 'profile' entry.
  (%options) <--profile>: Keep previous values associated with 'profile'
  in RESULT.
  (guix-package)[process-actions, process-query]: Handle the possible
  lack of 'profile' pair in OPTS.

system: Populate /etc/shells from ACCOUNT-SERVICE-TYPE.

* gnu/system.scm (user-shells): Remove.
  (operating-system-etc-service): Remove "shells" entry.
  (shells-file): Move to...
* gnu/system/shadow.scm (shells-file): ... here.  New procedure.
  (etc-skel): Rename to...
  (etc-files): ... this.  Add "shells" entry.
  (account-service-type): Adjust accordingly.

gnu: torsocks: Upgrade to 2.0.0.

* gnu/packages/tor.scm (torsocks): Update to 2.0.0.
  [source]: Fetch from git.torproject.org.  Use
  'torsocks-dns-test.patch'.
  [arguments, native-inputs]: New fields.
  [license]: Change to GPL2.
* gnu/packages/patches/torsocks-dns-test.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.