gnu: xf86-video-intel: Update to 2.99.917-2-9fe04af.

* gnu/packages/xorg.scm (xf86-video-intel): Update to 2.99.917-2-9fe04af.

gnu: fio: Enable optional helper scripts.

* gnu/packages/benchmark.scm (fio)[arguments]: Add 'patch-paths' and
'wrap-python-scripts' phases.
[inputs]: Add GNUPLOT, PYTHON-2, PYTHON2-NUMPY and PYTHON2-PANDAS.

gnu: fio: Update to 2.17.

* gnu/packages/benchmark.scm (fio): Update to 2.17.

gnu: lftp: Update to 4.7.5.

* gnu/packages/ftp.scm (lftp): Update to 4.7.5.
[source]: Rearrange mirrors.

gnu: mumble: Update to 1.2.19.

* gnu/packages/telephony.scm (mumble): Update to 1.2.19.

gnu: xapian: Update to 1.4.3.

* gnu/packages/search.scm (xapian): Update to 1.4.3.

gnu: dtc: Update description to reference HOWTO.

* gnu/packages/u-boot.scm (dtc)[description]: Modify.

system: More 'file-append' instead of #~(string-append #$thing …).

* gnu/system/shadow.scm (<user-account>)[shell]: Use 'file-append'.
(%base-user-accounts): Likewise.
* gnu/system/grub.scm (%background-image): Likewise.

system: Create home directories once 'file-systems' is up.

Fixes <http://bugs.gnu.org/21108>.
Reported by Andy Patterson <ajpatter@uwaterloo.ca>
and Leo Famulari <leo@famulari.name>.

* gnu/build/activation.scm (activate-users+groups)[activate-user]: Pass
  #:create-home? #t iff CREATE-HOME? and SYSTEM?.
(activate-user-home): New procedure.
* gnu/system/shadow.scm (account-shepherd-service): New procedure.
(account-service-type)[extensions]: Add SHEPHERD-ROOT-SERVICE-TYPE
extension.
* gnu/tests/base.scm (run-basic-test)["home"]
["skeletons in home directories"]: New tests.
* gnu/tests/install.scm (%separate-home-os, %separate-home-os-source)
(%test-separate-home-os): New variables.

gnu: nginx: Update to 1.11.9.

* gnu/packages/web.scm (nginx): Update to 1.11.9.

gnu: mg: Upgrade to 20161005.

* gnu/packages/mg.scm (mg)[source]: Upgrade to 20161005.
[native-inputs]: Add pkg-config.
[inputs]: Add libbsd.
[arguments]: Use modify-phases.  Use #:make-flags rather than patching the
Makefile.  Install tutorial.
[description]:  Clarify relation to GNU Emacs.

gnu: Add JOE.

* gnu/packages/text-editors.scm (joe): New variable.

gnu: libevent: Update to 2.1.8 [security fixes].

* gnu/packages/libevent.scm (libevent): Update to 2.1.8.
[inputs]: Change 'python-wrapper' to 'python-2'. Move 'which' to ...
[native-inputs]: ... here. New field.
(libevent-2.0): New variable.
* gnu/packages/patches/libevent-2.1-dns-tests.patch,
  gnu/packages/patches/libevent-2.0-evdns-fix-remote-stack-overread.patch
  gnu/packages/patches/libevent-2.0-evdns-fix-searching-empty-hostnames.patch
  gnu/packages/patches/libevent-2.0-evutil-fix-buffer-overflow.patch: New files.
* gnu/local.mk (dist_patch_DATA): Add them.
* gnu/packages/gnuzilla.scm (icecat)[inputs]: Change 'libevent' to 'libevent-2.0'.

lint: Use the "@" syntax for versioned packages in warnings.

* guix/scripts/lint.scm (emit-warning): Use the "@" syntax.

gnu: mdadm: Update to 4.0.

* gnu/packages/linux.scm (mdadm): Update to 4.0.
[arguments]: Add "CC=gcc" to #:make-flags.

gnu: parallel: Update to 20170122.

* gnu/packages/parallel.scm (parallel): Update to 20170122.

gnu: kbd: Update to 2.0.4.

* gnu/packages/linux.scm (kbd): Update to 2.0.4.

gnu: gdb: Update to 7.12.1.

* gnu/packages/gdb.scm (gdb): Update to 7.12.1.

gnu: xcalc: Update to 1.0.6.

* gnu/packages/xorg.scm (xcalc): Update to 1.0.6.

system: Introduce 'file-systems' Shepherd service.

* gnu/services/base.scm (file-system-shepherd-services): New procedure.
(file-system-service-type): Use it as the SHEPHERD-ROOT-SERVICE-TYPE
extension.
(user-processes-service-type): Change to take a single 'grace-delay'
parameter.
(user-processes-service): Remove 'file-systems' parameter.  Pass
GRACE-DELAY as the only value for the service.
* gnu/system.scm (essential-services): Adjust accordingly.