gnu: python-pygobject: Propagate glib and libffi.

* gnu/packages/glib.scm (python-pygobject): Move glib and libffi to propagated-inputs.
(python2-pygobject)[inputs]: Remove glib and libffi.

gnu: python-pygobject: Add search path for GI_TYPELIB_PATH.

* gnu/packages/glib.scm (python-pygobject)[native-search-paths]: Use the
same search paths as gobject-introspection.

gnu: orc: Update to 0.4.25.

* gnu/packages/gstreamer.scm (orc): Update to 0.4.25.

services: Use 'packages->manifest' in 'packages->profile-entry'.

This allows using (PACKAGE OUTPUT) in the packages field.
Reported by Jan Nieuwenhuizen <janneke@gnu.org>.

* gnu/services.scm (packages->profile-entry): Use 'packages->manifest'.

services: elogind: Rely on D-Bus activation.

Previously elogind was explicitly spawned by the Shepherd.  Now it is
activated by dbus-daemon on demand.

* gnu/packages/freedesktop.scm (elogind)[arguments]: Add
'fix-service-file' phase.
* gnu/services/desktop.scm (elogind-shepherd-service): Remove.
(elogind-dbus-service): New procedure.
(elogind-service-type): Do not extend SHEPHERD-ROOT-SERVICE-TYPE.  Use
'elogind-dbus-service' for DBUS-ROOT-SERVICE-TYPE.

gnu: alsa-modular-synth: Insert space to separate linker flags.

* gnu/packages/audio.scm (alsa-modular-synth)[arguments]: Add build
phase to separate linker flags.

gnu: alsa-modular-synth: Drop Qt 4.

* gnu/packages/audio.scm (alsa-modular-synth)[inputs]: Replace "qt-4"
with "qt".
[arguments]: Add configure flag to build with Qt 5.

gnu: vigra: Update to a development snapshot.

* gnu/packages/image.scm (vigra): Update to a git snapshot to fix build
  problems with the current python-numpy.

gnu: Add einstein.

* gnu/packages/games.scm (einstein): New variable.
* gnu/packages/patches/einstein-build.patch: New file.
* gnu-system.am (dist_patch_DATA): Register patch.

gnu: jalv: Drop Qt-4 support.

* gnu/packages/audio.scm (jalv)[inputs]: Drop qt-4. It does not receive any
  upstream security updates, and Qt-4 support is marked as experimental in
  the jalv documentation.

gnu: letsencrypt, python-acme: Update to 0.4.2.

These packages should be updated together.

* gnu/packages/tls.scm (letsencrypt): Update to 0.4.2.
(python-acme, python2-acme): Update to 0.4.2.

gnu: python-cryptography, python-cryptography-vectors: Update to 1.2.3.

These packages should be updated together.

* gnu/packages/python.scm (python-cryptography): Update to 1.2.3.
(python-cryptography-vectors): Update to 1.2.3.

doc: Mention syslogd configuration.

* gnu/services/base.scm (syslog-service): Add xref to Inetutils in the
docstring.
(%default-syslog.conf): Export.
* doc/guix.texi (Base Services): Update accordingly.

gnu: gnome: Sync description and synopsis.

* gnu/packages/gnome.scm (gnome)[synopsis, description]: Use official
GNU blurb.

gnu: nano: Update to 2.5.3.

* gnu/packages/nano.scm (nano): Update to 2.5.3.

gnu: libgit2: Update to 0.23.4.

* gnu/packages/version-control.scm (libgit2): Update to 0.23.4.

gnu: findnewest: Update to 0.3.

* gnu/packages/version-control.scm (findnewest): Update to 0.3.

gnu: exim: Update to 4.86.2 [fixes CVE-2016-1531].

* gnu/packages/mail.scm (exim): Update to 4.86.2.

gnu: Add byzanz.

* gnu/packages/gnome.scm (byzanz): New variable.

gnu: youtube-dl: Update to 2016.03.01.

* gnu/packages/video.scm (youtube-dl): Update to 2016.03.01.