gnu: Add sslh.

* gnu/packages/networking.scm (sslh): New variable.

gnu: httping: Update to 2.5.

* gnu/packages/networking.scm (httping): Update to 2.5.

gnu: Add fbida.

* gnu/packages/pdf.scm (fbida): New variable.

import: utils: Remove dependency on (json) module.

This fixes a regression introduced by commit
fbe9c1012820ab72f022a6ec958c35b431ae7a74.

* guix/import/utils.scm: Remove unused (json) module.

gnu: hdf4: Fix non-x86 architectures.

* gnu/packages/patches/hdf4-architectures.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register patch.
* gnu/packages/maths.scm (hdf4)[source]: Add patch.

gnu: certbot, python-acme: Update to 0.9.3.

These packages should be updated together.

* gnu/packages/tls.scm (certbot): Update to 0.9.3.
[source]: Use pypi-uri.
(python-acme, python2-acme): Update to 0.9.3.
[source]: Use pypi-uri.

gnu: python-dnspython: Update to 0.15.0.

* gnu/packages/python.scm (python-dnspython, python2-dnspython): Update
to 0.15.0.

gnu: python-werkzeug: Update to 0.11.11.

* gnu/packages/python.scm (python-werkzeug, python2-werkzeug):
Update to 0.11.11.

gnu: python-pyopenssl: Update to 16.1.0.

* gnu/packages/python.scm (python-pyopenssl, python2-pyopenssl): Update
to 16.1.0
[source]: Use pypi-uri.

gnu: python-pyasn1: Update to 0.1.9.

* gnu/packages/python.scm (python-pyasn1, python2-pyasn1): Update to 0.1.9.
[source]: Use pypi-uri.

gnu: Add python-whoosh.

* gnu/packages/python.scm (python-whoosh, python2-whoosh): New variables.

gnu: Add arm-none-eabi-toolchain variants.

* gnu/packages/embedded.scm (arm-none-eabi-toolchain): New procedure.
(arm-none-eabi-toolchain-4.9, arm-none-eabi-nano-toolchain-4.9,
arm-none-eabi-toolchain-6, arm-none-eabi-nano-toolchain-6): New
variables.

Co-authored-by: Ricardo Wurmus <rekado@elephly.net>

gnu: Add arm-none-eabi-gcc-6.

* gnu/packages/embedded.scm (gcc-arm-none-eabi-6): New variable.
* gnu/packages/patches/gcc-6-arm-none-eabi-multilib.patch: New file.
* gnu/packages/patches/gcc-6-cross-environment-variables.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add the patches.

gnu: youtube-dl: Update to 2016-10-16.

* gnu/packages/video.scm (youtube-dl): Update to 2016-10-16.

gnu: dbus-1.10.12: Fix search paths.

Add the patches from dbus's source field back into its replacement. This ensures
that the grafted dbus package can find its services on GuixSD.

This is a follow-up to commit 34f9582aad557cd816bb3215fb4d7da7d1c5229a.

* gnu/packages/glib.scm (dbus-1.10.12)[source]: Inherit from dbus.

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

graph: Add '%referrer-node-type'.

* guix/scripts/graph.scm (ensure-store-items): New procedure.
(%reference-node-type)[convert]: Use it.
(non-derivation-referrers): New procedure.
(%referrer-node-type): New variable.
(%node-types): Add it.
* tests/graph.scm ("referrer DAG"): New test.
* doc/guix.texi (Invoking guix graph): Document it.

grafts: Remove unused variables and confusing monad use.

* guix/grafts.scm (cumulative-grafts)[return/cache]: Use %STATE-MONAD,
not %STORE-MONAD.
Remove unused 'origins' variable and unnecessary inner 'cache'
variable.

gnu: assimp: Update to 3.3.1.

* gnu/packages/graphics.scm (assimp): Update to 3.3.1.
[native-inputs]: Remove unzip.

gnu: jsoncpp: Update to 1.7.7.

* gnu/packages/serialization.scm (jsoncpp): Update to 1.7.7.

gnu: cereal: Update to 1.2.1.

* gnu/packages/serialization.scm (cereal): Update to 1.2.1.