gnu: gst-plugins-ugly: Update to 1.6.1.

* gnu/packages/gstreamer.scm (gst-plugins-ugly): Update to 1.6.1.

gnu: gst-plugins-good: Update to 1.6.1.

* gnu/packages/gstreamer.scm (gst-plugins-good): Update to 1.6.1.

gnu: gst-plugins-base: Update to 1.6.1.

* gnu/packages/gstreamer.scm (gst-plugins-base): Update to 1.6.1.
  [arguments]: Disable parallel tests.

gnu: gstreamer: Update to 1.6.1.

* gnu/packages/gstreamer.scm (gstreamer): Update to 1.6.1.
  [arguments]: Remove #:make-flags.

gnu: guix: Do not retain dependency on Graphviz.

* gnu/packages/package-management.scm (guix-devel)[arguments]: Add
  ac_cv_path_DOT_USER_PROGRAM=dot to #:configure-flags.

doc: Linux-libre 3.19 is needed for using containers.

* doc/guix.texi ("invoking guix environment", "invoking guix system"):
  3.10 is actually too old without backported patches, so change to 3.19.

gnu: Add nestopia-ue.

* gnu/packages/games.scm (nestopia-ue): New variable.

doc: './pre-inst-env guix pull' won't upgrade local source tree.

* doc/contributing.texi (Running Guix Before It Is Installed): Clarify
  './pre-inst-env guix pull' won't upgrade local source tree.
* doc/guix.texi (Invoking guix pull): Mention ~/.config/guix/latest.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

gnu: guix: Update development snapshot.

* gnu/packages/package-management.scm (guix-0.8.3)[arguments]: In
  'disable-container-tests' phase, modify
  "tests/guix-environment-container.sh".  Add 'set-SHELL' phase.
* gnu/packages/package-management.scm (guix-devel): Update to b485f75.

gnu: tcpdump: Update to 4.7.4.

* gnu/packages/admin.scm (tcpdump): Update to 4.7.4.

gnu: libpcap: Update to 1.7.4.

* gnu/packages/admin.scm (libpcap): Update to 1.7.4.

import: gnu: Update to the (guix upstream) API.

This is a followup to 0a7c5a0.

* guix/import/gnu.scm (preferred-archive-type): Use
  'upstream-source-archive-types' instead of 'gnu-release-archive-types'.
  (gnu-package->sexp): Use 'upstream-source-urls' et al.  Update call to
  'download-tarball'.
  (gnu->guix-package): Use <upstream-source> instead of <gnu-release>.
* guix/upstream.scm (upstream-source-archive-types): Export.

tests: Set 'SHELL' for 'guix environment'.

* tests/guix-environment.sh: Export 'SHELL'.

guix system: Always build grub.cfg for 'init' and 'reconfigure'.

Fixes <http://bugs.gnu.org/21068>.
Reported by Germano Gabbianelli <tyrion.mx@gmail.com>
and Mark H Weaver <mhw@netris.org>.

* guix/scripts/system.scm (perform-action): Always add GRUB.CFG to DRVS
  for 'init' and 'reconfigure'.

Co-authored-by: Mark H Weaver <mhw@netris.org>

services: udisks: Add UDisks to the system profile.

* gnu/services/desktop.scm (udisks-service-type): Extend
  PROFILE-SERVICE-TYPE.

services: avahi: Add Avahi to the system profile.

* gnu/services/avahi.scm (avahi-service-type): Extend
  PROFILE-SERVICE-TYPE.
  (avahi-service): Adjust docstring.
* doc/guix.texi (Networking Services): Adjust accordingly.
* gnu/system/examples/desktop.tmpl (packages): Remove AVAHI.

services: slim: Add xterm to the system profile.

* gnu/services/xorg.scm (slim-service-type): Extend
  PROFILE-SERVICE-TYPE.
* gnu/system/examples/desktop.tmpl (packages): Remove XTERM.

services: wicd: Add Wicd to the system profile.

* gnu/services/networking.scm (wicd-service-type): Extend
  PROFILE-SERVICE-TYPE.
  (wicd-service): Mention it in docstring.
* doc/guix.texi (Networking Services): Update documentation
  accordingly.
* gnu/system/examples/desktop.tmpl (packages): Remove WICD.

services: Add 'profile-service-type'.

* gnu/services.scm (packages->profile-entry): New procedure.
  (profile-service-type): New variable.
* gnu/system.scm (operating-system-directory-base-entries): Remove
  the "profile" entry.
  (essential-services): Add a PROFILE-SERVICE-TYPE instance.
  (operating-system-profile): Rewrite in terms of 'fold-services'.
* doc/guix.texi (Service Reference): Add 'profile-service-type'.
* doc/images/service-graph.dot: Likewise.

services: Add 'system-service-type'.

* gnu/services.scm (system-derivation): New procedure.
  (system-service-type): New variable.
  (boot-script-entry): New procedure.
  (boot-service-type): Extend SYSTEM-SERVICE-TYPE.
  (etc-entry): New procedure.
  (etc-service-type): Extend SYSTEM-SERVICE-TYPE.
  (fold-services): Change default #:target-type to SYSTEM-SERVICE-TYPE.
* gnu/system.scm (operating-system-directory-base-entries): New procedure.
  (essential-services): Use it.  Add an instance of
  SYSTEM-SERVICE-TYPE.
  (operating-system-boot-script): Pass #:target-type to 'fold-services'.
  (operating-system-derivation): Rewrite in terms of 'fold-services'.
* gnu/system/linux-container.scm (system-container): Remove.
  (container-script): Use 'operating-system-derivation'.
* guix/scripts/system.scm (export-extension-graph): Replace
  BOOT-SERVICE-TYPE by SYSTEM-SERVICE-TYPE.
* doc/images/service-graph.dot: Add 'system' node and edges.
* doc/guix.texi (Service Composition): Mention SYSTEM-SERVICE-TYPE.
  (Service Reference): Document it.  Update 'fold-services'
  documentation.