gnu: dvdstyler: Remove hard-coded version string.

* gnu/packages/cdrom.scm (dvdstyler)[arguments]: Remove a hard-coded
version string from the docbook-xsl search path.

gnu: libdvbpsi: Update to 1.3.2.

* gnu/packages/video.scm (libdvbpsi): Update to 1.3.2.

gnu: tinc: Update to 1.0.33.

* gnu/packages/vpn.scm (tinc): Update to 1.0.33.

gnu: gource: Update to 0.48.

* gnu/packages/version-control.scm (gource): Update to 0.48.

gnu: youtube-dl: Update to 2018.02.22.

* gnu/packages/video.scm (youtube-dl): Update to 2018.02.22.

gnu: libfilezilla: Update to 0.12.1.

* gnu/packages/ftp.scm (libfilezilla): Update to 0.12.1.

gnu: automake: Add 1.16.

* gnu/packages/autotools.scm (automake-1.16): New variable.

build: Require Guile >= 2.0.13.

* README, configure.ac, doc/guix.texi (Requirements): Increase minimum
Guile version from 2.0.9 to 2.0.13.
* config-daemon.ac: Remove use of 'GUIX_CHECK_UNBUFFERED_CBIP'.
* m4/guix.m4 (GUIX_CHECK_UNBUFFERED_CBIP): Remove.
* guix/build/download.scm (current-http-proxy): Remove.
* guix/build/syscalls.scm (%libc-errno-pointer, errno): Remove.
(syscall->procedure): Use #:return-errno unconditionally.
* guix/hash.scm (open-sha256-input-port)[unbuffered]: Remove outdated
comment.
* guix/http-client.scm (when-guile<=2.0.5-or-otherwise-broken): Remove.
<top level>: Remove 'when-guile<=2.0.5-or-otherwise-broken' block.
* guix/scripts/substitute.scm (fetch): Remove 'guile-version>?'
conditional.
* tests/hash.scm (supports-unbuffered-cbip?): Remove.
<top level>: Remove 'test-skip' call.

gnu: python-scandir: Run the test suite.

* gnu/packages/python.scm (python-scandir)[arguments]: Replace CHECK-PHASE.

gnu: python-scandir: Update to 1.7.

* gnu/packages/python.scm (python-scandir): Update to 1.7.
[description]: Mention that the Python3 variant is obsolete.

gnu: python2-pathlib2: Update to 2.3.0.

* gnu/packages/python.scm (python2-pathlib2): Update to 2.3.0.
[propagated-inputs]: Add PYTHON2-SCANDIR.

gnu: python-ipython: Update to 5.5.0.

* gnu/packages/python.scm (python-ipython): Update to 5.5.0.

gnu: python-pickleshare: Run the tests.

* gnu/packages/databases.scm (python-pickleshare)[arguments]: Replace CHECK-PHASE.
[native-inputs]: Add PYTHON-PYTEST.

gnu: python2-pathlib2: Propagate python2-six.

* gnu/packages/python.scm (python2-pathlib2)[native-inputs]: Move to ...
[propagated-inputs] ... here.

gnu: python-pickleshare: Update to 0.7.4.

* gnu/packages/databases.scm (python-pickleshare): Update to 0.7.4.
[source](uri): Use PYPI-URI.
[propagated-inputs]: Remove.
[properties]: Delay python2 variant.
(python2-pickleshare)[propagated-inputs]: Add PYTHON2-PATHLIB2.

gnu: behave: Update to 1.2.6.

* gnu/packages/check.scm (behave): Update to 1.2.6.
[source](uri): Adjust file extension.
[native-inputs]: Add PYTHON-PATHPY and PYTHON-PYTEST.

gnu: python-pathpy: Update to 11.0.

* gnu/packages/python.scm (python-pathpy): Update to 11.0.
[source](uri): Use PYPI-URI.
[outputs]: Remove field.
[arguments]: Set #:tests? #f.  Remove #:phases.

gnu: python-parse-type: Update to 0.4.2.

* gnu/packages/python.scm (python-parse-type): Update to 0.4.2.
[source](uri): Use PYPI-URI.
[arguments]: Remove field.

gnu: python-parse: Update to 1.8.2.

* gnu/packages/patches/python-parse-too-many-fields.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Remove it.
* gnu/packages/python.scm (python-parse): Update to 1.8.2.
[source](patches): Remove.
[arguments]: Use INVOKE instead of SYSTEM*.

gnu: neomutt: Update to 20180223.

* gnu/packages/mail.scm (neomutt): Update to 20180223.
[native-inputs]: Use 'docbook-xml-4.2'.
[arguments]: Remove 'fix-docbook' phases.

Signed-off-by: Marius Bakke <mbakke@fastmail.com>