Merge branch 'master' into core-updates

import: Add hackage importer.

* guix/scripts/import.scm (importers): Add hackage.
* guix/scripts/import/hackage.scm: New file.
* po/guix/POTFILES.in: Add guix/scripts/import.scm.
* doc/guix.texi: Add section on 'hackage' importer.

Merge branch 'master' into core-updates

nls: Add Danish translation.

* po/guix/da.po: New file.
* po/guix/LINGUAS: Add 'da'.

scripts: Add 'publish' command.

* guix/scripts/publish.scm: New file.
* po/guix/POTFILES.in: Add it.
* tests/publish.scm: New file.
* Makefile.am (MODULES): Add script module.
  (SCM_TESTS): Add test module.
* doc/guix.texi ("Invoking guix publish"): New node.

Merge branch 'master' into core-updates

Fix remaining references to "substitute-binary".

* nix/nix-daemon/guix-daemon.cc (main): Change substitute-binary to
  substitute.
* po/guix/POTFILES.in: Likewise.
* tests/guix-daemon.sh: Likewise.
* tests/guix-system.sh: Likewise.

Merge branch 'master' into core-updates

services: Statically report duplicate dmd service identifiers.

Reported by 白い熊 @相撲道 <guix-devel_gnu.org@sumou.com>
at <http://lists.gnu.org/archive/html/guix-devel/2015-03/msg00264.html>.

* gnu/services/dmd.scm (assert-no-duplicates): New procedure.
  (dmd-configuration-file): Use it.
* po/guix/POTFILES.in: Add gnu/services/dmd.scm.
* tests/guix-system.sh (errorfile): Add test.

nls: Update 'eo' translation.

nls: Update 'vi' translation.

nls: Add a few more package modules for translation.

* po/packages/POTFILES.in: List a few more files.

Merge branch 'master' into core-updates

nls: Update 'eo' translation.

Merge branch 'master' into core-updates

nls: Add French translation for packages.

Merge branch 'master' into 'core-updates'.

nls: Add French translation.

nls: Update 'eo' translation.

nls: Update Hungarian translation.