gnu: Add Aseba.

* gnu/packages/robotics.scm (aseba): New variable.

gnu: Add Enki.

* gnu/packages/robotics.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

gnu: Add Dashel.

* gnu/packages/cpp.scm (dashel): New variable.

gnu: fftw: Add "fftw-avx" optimized variant.

* gnu/packages/algebra.scm (fftw-avx): New variable.

gnu: fftw: Add version 3.3.7.

* gnu/packages/algebra.scm (fftw-3.3.7): New variable.

gnu: linux-libre: Update to 4.15, while retaining 4.14 LTS.

* gnu/packages/linux.scm (%linux-libre-version): Update to 4.15.
(%linux-libre-hash): Update hash.
(%linux-libre-arm-generic-4.14, %linux-libre-arm-omap2plus-4.14)
(%linux-libre-4.1-version, %linux-libre-4.1-hash): New variables.
* gnu/packages/aux-files/linux-libre/4.15-arm.conf,
gnu/packages/aux-files/linux-libre/4.15-i686.conf,
gnu/packages/aux-files/linux-libre/4.15-x86_64.conf: New files.
* Makefile.am (AUX_FILES): Add them.

gnu: linux-libre: Update configuration files to latest releases.

* gnu/packages/aux-files/linux-libre/4.14-i686.conf,
gnu/packages/aux-files/linux-libre/4.14-x86_64.conf,
gnu/packages/aux-files/linux-libre/4.9-i686.conf,
gnu/packages/aux-files/linux-libre/4.9-x86_64.conf,
gnu/packages/aux-files/linux-libre/4.4-i686.conf,
gnu/packages/aux-files/linux-libre/4.4-x86_64.conf,
gnu/packages/aux-files/linux-libre/4.1-i686.conf,
gnu/packages/aux-files/linux-libre/4.1-x86_64.conf: Update using
"make oldconfig" on the latest point releases.

gnu: linux-libre: NVME core support is now built-in.

* gnu/system/linux-initrd.scm (base-initrd)[linux-modules]: Remove "nvme".
* gnu/packages/aux-files/linux-libre/4.1-i686.conf,
gnu/packages/aux-files/linux-libre/4.1-x86_64.conf,
gnu/packages/aux-files/linux-libre/4.4-i686.conf,
gnu/packages/aux-files/linux-libre/4.4-x86_64.conf: Set CONFIG_BLK_DEV_NVME=y.
* gnu/packages/aux-files/linux-libre/4.9-i686.conf,
gnu/packages/aux-files/linux-libre/4.9-x86_64.conf,
gnu/packages/aux-files/linux-libre/4.14-arm.conf,
gnu/packages/aux-files/linux-libre/4.14-i686.conf,
gnu/packages/aux-files/linux-libre/4.14-x86_64.conf: Set CONFIG_BLK_DEV_NVME=y
and CONFIG_NVME_CORE=y.

gnu: Add mongo-tools.

* gnu/packages/databases.scm (mongo-tools): New variable.

gnu: Add go-github.com-nsf-termbox-go.

* gnu/packages/terminals.scm (go-github.com-nsf-termbox-go): New variable.

gnu: Add go-github.com-mattn-go-runewidth.

* gnu/packages/textutils.scm (go-github.com-mattn-go-runewidth): New variable.

gnu: Add go-gopkg.in-tomb.v2.

* gnu/packages/golang.scm (go-gopkg.in-tomb.v2): New variable.

gnu: Add go-gopkg.in-mgo.v2.

* gnu/packages/databases.scm (go-gopkg.in-mgo.v2): New variable.

gnu: Add daemontools.

* gnu/packages/admin.scm (daemontools): New variable.

gnu: Add go-gopkg.in-check.v1.

* gnu/packages/check.scm (go-gopkg.in-check.v1): New variable.

gnu: Add go-github.com-jessevdk-go-flags.

* gnu/packages/golang.scm (go-github.com-jessevdk-go-flags): New variable.

gnu: Add go-github.com-howeyc-gopass.

* gnu/packages/terminals.scm (go-github.com-howeyc-gopass): New variable.

gnu: Add go-golang.org-x-crypto-ssh-terminal.

* gnu/packages/terminals.scm (go-golang.org-x-crypto-ssh-terminal): New
  variable.

gnu: libdvdcss: Update to 1.4.1.

* gnu/packages/video.scm (libdvdcss): Update to 1.4.1.

gnu: libbluray: Update to 1.0.2.

* gnu/packages/video.scm (libbluray): Update to 1.0.2.
[arguments]: Add `refer-to-libxml2-in-.pc-file' phase.