gnu: ghc-quickcheck: Update to 2.8.2.

* gnu/packages/haskell.scm (ghc-quickcheck): Update to 2.8.2.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: Add r-ggthemes.

* gnu/packages/statistics.scm (r-ggthemes):  New variable.

build: Remove reference to 'doc/emacs.texi'.

This is a followup to deb6276dda81a69da38e842d269c5370a28fa5cf.

* doc/local.mk (EXTRA_DIST): Remove 'emacs.texi'.

etc: Add 'indent-package.el' script.

* configure.ac: Check for 'emacs', substitute 'EMACS', and emit
'etc/indent-package.el'.
* etc/indent-package.el.in: New file.
* doc/contributing.texi (Formatting Code): Mention
'etc/indent-package.el'.
(Submitting Patches): Likewise, and link to the above node.

Co-authored-by: Alex Kost <alezost@gmail.com>

gnu: guix: Update development snapshot.

* gnu/packages/package-management.scm (guix-devel): Update to eefd042.

gnu: eudev: Add 'eudev-with-hwdb' variant that contains 'hwdb.bin'.

* gnu/packages/linux.scm (eudev-with-hwdb): New variable.
(usbutils)[inputs]: Use it instead of EUDEV.

gnu: Add r-txdb-mmusculus-ucsc-mm10-knowngene.

* gnu/packages/bioinformatics.scm (r-txdb-mmusculus-ucsc-mm10-knowngene): New variable.

gnu: bind: Update to 9.10.4-P5 [fixes CVE-2016-{9131,9147,9444}].

* gnu/packages/dns.scm (bind): Update to 9.10.4-P5.

gnu: isc-dhcp: Update bundled bind to 9.9.9-P5 [security fixes].

Fixes CVE-2016-{9131,9147,9444}.

* gnu/packages/admin.scm (isc-dhcp): Update bundled bind to 9.9.9-P5.

gnu: fprintd: Provide the right file name for 'fprintd.conf'.

* gnu/packages/freedesktop.scm (fprintd)[arguments]: New field.

perform-download: Add backward-compatible case.

This is meant to ease transition for people running an older guix-daemon
invoking a recent 'guix perform-download' with only one argument.

This is a followup to 9b5364a3afb03414bd6e3ded2fbfdacabe4e8870.

* guix/scripts/perform-download.scm (perform-download): Make 'output'
optional.  Bind 'output*' from DRV's "out" and honor it.
(guix-perform-download): Add clause with one argument.

gnu: abiword: Remove timestamps from libabiword.

* gnu/packages/abiword.scm (abiword)[source](modules, snippet): New
fields.

gnu: abiword: Allow GTK+ schemas to be found.

Fixes <http://bugs.gnu.org/25037>.
Reported by Adonay Felipe Nogueira <adfeno@openmailbox.org>.

* gnu/packages/abiword.scm (abiword)[build-system]: Set to
GLIB-OR-GTK-BUILD-SYSTEM.

gnu: Add python2-cheetah

* gnu/packages/python.scm (python2-cheetah): New variable.

Signed-off-by: Leo Famulari <leo@famulari.name>

derivations: Make <derivation> record datatype immutable.

* guix/derivations.scm (<derivation>): Make it immutable.
(derivation): Use generic 'set-field' instead of ad-hoc functional setter.

git download: Remove redundant argument in 'gexp->derivation' call.

* guix/git-download.scm (git-fetch): Call 'gexp->derivation' with only one
'#:local-build?' keyword argument.

gnu: libosinfo: Fix substitute fetching for usb.ids.

* gnu/packages/qemu.scm (libosinfo)[native-inputs]: Add 'file-name' field to
'origin' record of "usb.ids".  Otherwise, the default file name contains a "?"
which leads to failure to fetch nars from substitute servers.

gnu: ardour: Add eudev dependency.

* gnu/packages/audio.scm (ardour)[inputs]: Add eudev.

Revert "gnu: Add threaded variants of fftw and fftwf for Ardour and mod-host."

These variants are no longer needed.

Followup to 86f4e9d76a75c405b3b6c5b3f1717df0e45f4e68.

This reverts commit 45591fd7fde1a400a416cb99939f6dd766445f94.

gnu: kcrash: Work around race condition when starting Xvfb.

Sometimes tests would start running before Xvfb is listening.
See <https://hydra.gnu.org/build/1750201>.

* gnu/packages/kde-frameworks.scm (kcrash)[arguments]: In
'start-xorg-server', add 'sleep' call after starting Xvfb.  Pass "Xvfb"
to 'system' instead of its absolute file name.