gnu: emacs-debbugs: Update to 0.11.

* gnu/packages/emacs.scm (emacs-debbugs): Update to 0.11.

system: Record store file system info in each generation.

* gnu/system.scm (<boot-parameters>)[store-device, store-mount-point]:
New fields.
(read-boot-parameters): Initialize them.
(operating-system-grub.cfg): Likewise.  Remove STORE-FS argument from
call to 'grub-configuration-file'.
(operating-system-parameters-file): Add 'store' element in
'boot-parameters'.
* gnu/system/grub.scm (strip-mount-point): Replace 'store-fs' parameter
by 'mount-point'; adjust accordingly.  Adjust callers.
(<menu-entry>)[device, device-mount-point]: New fields.
(eye-candy): Replace 'root-fs' parameter by 'store-device'; add
'store-mount-point'.  Use keyword arguments for 'system' and 'port'.
(grub-root-search): Remove 'root-fs' by 'device' and adjust
accordingly.
(grub-configuration-file): Remove 'store-fs' parameter.  Adjust
accordingly.
* guix/scripts/system.scm (previous-grub-entries): Initialize 'device'
and 'device-mount-point' fields from PARAMS.
* doc/guix.texi (GRUB Configuration): Document 'device' and
'device-mount-point'.  Explain that 'linux' can be prefixed by a GRUB
device name.

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

gnu: Add nethogs.

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

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

gnu: Add python-imagesize.

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

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

gnu: python-pyusb: Prettify library substitution.

* gnu/packages/libusb.scm (python-pyusb)[arguments]: Use srfi-1 to make
the "fix-libusb-reference" phase clearer.

gnu: python-waf: Download over https.

* gnu/packages/python.scm (python-waf)[source]: Use https.

gnu: samba: Update to 4.5.1.

* gnu/packages/samba.scm (samba): Update to 4.5.1.

profiles: manifest-lookup-package: Cosmetic changes.

* guix/profiles.scm (manifest-lookup-package): Rename variables; use
"string=?" instead of "equal?".

gnu: git: Update to 2.10.2.

* gnu/packages/version-control.scm (git): Update to 2.10.2.

gnu: python-nltk: Disable the test suite.

The tests were silently skipped with Python 3.4. With Python 3.5, this caused
the build of python-nltk to fail.

* gnu/packages/python.scm (python-nltk, python2-nltk)[arguments]:
Disable the tests.

gnu: python-pyquery: Add inputs for test suite.

* gnu/packages/python.scm (python-pyquery,
python2-pyquery)[native-inputs]: Add python-webob and python-webtest.

gnu: python-pika: Add inputs for test suite.

* gnu/packages/python.scm (python-pika, python2-pika)[native-inputs]: Add
python-pyev, python-tornado.

gnu: Add python-pyev.

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

gnu: python-prompt-toolkit: Disable the test suite.

The tests were silently skipped with Python 3.4. With Python 3.5, this caused
the build of python-prompt-toolkit to fail.

* gnu/packages/python.scm (python-prompt-toolkit,
python2-prompt-toolkit)[arguments]: Disable the tests.

gnu: python-publicsuffix2: Disable the test suite.

The tests were silently skipped with Python 3.4. With Python 3.5, this caused
the build of python-publicsuffix2 to fail.

* gnu/packages/python.scm (python-publicsuffix2, python2-publicsuffix2)
[arguments]: Disable the tests.

gnu: python-pyechonest: Remove package.

* gnu/packages/music.scm (python-pyechonest): Remove variable.

gnu: Add openocd.

* gnu/packages/embedded.scm (openocd): New variable.
* gnu/packages/patches/openocd-nrf52.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add the patch.

gnu: Add jimtcl.

* gnu/packages/embedded.scm (jimtcl): New variable.

gnu: Add libjaylink.

* gnu/packages/embedded.scm (libjaylink): New variable.

gnu: Add hidapi.

* gnu/packages/libusb.scm (hidapi): New variable.