gnu: Add libiconv.

* gnu/packages/base.scm (libiconv): New variable.

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

gnu: linux-libre: Update to 4.5.3.

* gnu/packages/linux.scm (linux-libre): Update to 4.5.3.

gnu: linux-libre-4.4: Update to 4.4.9.

* gnu/packages/linux.scm (linux-libre-4.4): Update to 4.4.9.

gnu: linux-libre-4.1: Update to 4.1.23.

* gnu/packages/linux.scm (linux-libre-4.1): Update to 4.1.23.

emacs: main: Use (guix combinators).

Reported by rsiddharth on #guix.
This is a followup to commit 958dd3ce68733bcd5c1231424c7e4ad39e67594a.

* emacs/guix-main.scm: Use (guix combinators) module as 'memoize' moved there.

gnu: libressl: Update to 2.3.4 [security fixes].

Fixes CVE-2016-{2105, 2106, 2107, 2108, 2109}.

* gnu/packages/tls.scm (libressl): Update to 2.3.4.

build: Add 'run-system-tests.scm'.

This file was meant to be added as part of
commit e9f693d06f94bd96488c3910dba6504f94a6b6f9.

* build-aux/run-system-tests.scm: New file.
* Makefile.am (EXTRA_DIST): Add it.

tests: Add whole-system test.

* gnu/system/vm.scm (virtualized-operating-system): Export.
* gnu/tests/base.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* Makefile.am (check-system): New target.

Add (gnu tests) and (gnu build marionette).

* gnu/build/marionette.scm, gnu/tests.scm: New files.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add them.
* gnu/system/vm.scm (common-qemu-options): Remove '-serial stdio'.

system: Add procedures to access user accounts and service names.

* gnu/system.scm (operating-system-user-accounts)
(operating-system-shepherd-service-names): New procedures.

gnu: java-qdox: Escape "@" in description.

* gnu/packages/java.scm (java-qdox-1.12)[description]: Use "@@tag", not
"@tag".

build: Preserve stderr for shell tests.

Fixes a regression introduced in
a9edb211e733b8b34e67ec3b4450567e9376986f where the .log files of the .sh
tests would not contain stderr.

* build-aux/test-env.in: Redirect stderr only when --quiet-stderr is
passed.
* Makefile.am (SCM_LOG_DRIVER): Add --quiet-stderr.

utils: Move combinators to (guix combinators).

* guix/utils.scm (compile-time-value, memoize, fold2)
(fold-tree, fold-tree-leaves): Move to...
* guix/combinators: ... here.  New file.
* tests/utils.scm ("fold2, 1 list", "fold2, 2 lists")
(fold-tree tests): Move to...
* tests/combinators.scm: ... here.  New file.
* Makefile.am (MODULES, SCM_TESTS): Add them.
* gnu/packages.scm, gnu/packages/bootstrap.scm,
gnu/services/herd.scm, guix/build-system/gnu.scm,
guix/build-system/python.scm, guix/derivations.scm,
guix/gnu-maintenance.scm, guix/import/elpa.scm,
guix/scripts/archive.scm, guix/scripts/build.scm,
guix/scripts/graph.scm, guix/scripts/lint.scm,
guix/scripts/size.scm, guix/scripts/substitute.scm,
guix/serialization.scm, guix/store.scm, guix/ui.scm: Adjust imports
accordingly.

utils: Remove 'split'.

This procedure was redundant with SRFI-1's 'break'.

* guix/utils.scm (split): Remove.
* tests/utils.scm ("split, element is in list")
("split, element is not in list"): Remove.

environment: Use 'break' instead of 'split'.

* guix/scripts/environment.scm (parse-args): Use 'break' instead of
'split'.

services: herd: Move UI handling to 'guix system'.

This makes (gnu services herd) independent of (guix ui).

* gnu/services/herd.scm (&shepherd-error, &service-not-found-error)
(&action-not-found-error, &action-exception-error)
(&unknown-shepherd-error): New error condition types.
(report-action-error): Remove.
(raise-shepherd-error): New procedure.
(display-message): Do not use 'info' and '_'.
(invoke-action): Use 'raise-shepherd-error' instead of
'report-action-error'.  Do not use 'warning'.
(current-services): Do not use 'warning'.
* guix/scripts/system.scm (with-shepherd-error-handling): New macro.
(report-shepherd-error, call-with-service-upgrade-info): New
procedures.
(upgrade-shepherd-services): Use it.

gnu: tvtime: Update to 1.0.10.

* gnu/packages/tv.scm (tvtime): Update to 1.0.10.
[source]: Remove patches.
[inputs]: Add 'alsa-lib'.
* gnu/packages/patches/tvtime-gcc41.patch,
gnu/packages/patches/tvtime-pngoutput.patch,
gnu/packages/patches/tvtime-videodev2.patch,
gnu/packages/patches/tvtime-xmltv.patch: Remove files.
* gnu/local.mk (dist_patch_DATA): Remove them.

gnu: libcue: Update to 2.1.0.

* gnu/packages/cdrom.scm (libcue): Update to 2.1.0.
[build-system]: Use 'cmake-build-system' (the upstream moved to it).
[native-inputs]: Add 'bison' and 'flex'.

Update .mailmap.

* .mailmap: Add new entries for Danny Milosavljevic, Nils Gillmann and
  Raymond Nicholson.

gnu: gnupg: Update to 2.1.12.

* gnu/packages/gnupg.scm (gnupg): Update to 2.1.12.
[source]: Remove patch.
* gnu/packages/patches/gnupg-simple-query-ignore-status-messages.patch:
Remove file.
* gnu/local.mk (dist_patch_DATA): Remove reference.