gnu: python-atomicwrites: Update to 0.1.9.

* gnu/packages/python.scm (python-atomicwrites): Update to 0.1.9.

gnu: python-lxml: Update to 3.5.0.

* gnu/packages/python.scm (python-lxml, python2-lxml): Update to 3.5.0.
[source]: Use pypi-uri.

gnu: python-sqlalchemy: Update to 1.0.12.

* gnu/packages/python.scm (python-sqlalchemy): Update to 1.0.12.

gnu: python-ly: Update to 0.9.3.

* gnu/packages/python.scm (python-ly): Update to 0.9.3.

gnu: Add python-wtforms

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

gnu: python-wheel: Define 'python2-variant'.

* gnu/packages/python.scm (python-wheel)[properties]: New field.
(python2-wheel): Use 'strip-python2-variant'.
(python2-requests): Take the result of 'package-with-python2' directly.
* gnu/packages/openstack.scm (python2-requests-mock): Likewise.
(python2-oslosphinx): Likewise.

gnu: python-jsonschema: Define 'python2-variant'.

* gnu/packages/python.scm (python-jsonschema)[properties]: New field.
(python2-jsonschema): Use 'strip-python2-variant'.
* gnu/packages/openstack.scm (python2-tempest-lib): Take the result of
'package-with-python2' directly.

gnu: python-cryptography: Define 'python2-variant'.

* gnu/packages/python.scm (python-cryptography)[properties]: New field.
(python2-cryptography): Use 'strip-python2-variant'.
(python2-pyopenssl): Take the result of 'package-with-python2' directly.

gnu: python2-fastlmm: Update to 0.2.21.

* gnu/packages/python.scm (python2-fastlmm): Update to 0.2.21.

gnu: python2-pysnptools: Update to 0.3.5.

* gnu/packages/python.scm (python2-pysnptools): Update to 0.3.5.

gnu: python-numpy-bootstrap: Update to 1.10.4.

* gnu/packages/python.scm (python-numpy-bootstrap): Update to 1.10.4.

gnu: python-pandas: Update to 0.16.2.

* gnu/packages/python.scm (python-pandas): Update to 0.16.2.

gnu: python-pillow: Update to 3.1.1 [fixes CVE-2016-{0740, 0775}].

* gnu/packages/python.scm (python-pillow, python2-pillow): Update to 3.1.1.

gnu: Add python2-xdo.

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

gnu: python-matplotlib: Define 'python2-variant'.

* gnu/packages/python.scm (python2-numpy): Take the result of
'package-with-python2' directly.
(python2-scipy): Likewise.
(python-matplotlib)[properties]: New field.
(python2-matplotlib): Call 'strip-python2-variant'.

gnu: python-cython: Define 'python2-variant'.

* gnu/packages/python.scm (python-cython)[properties]: New field.
(python2-cython): Use 'strip-python2-variant'.

gnu: python2-pysqlite: Update to 2.8.1.

* gnu/packages/python.scm (python2-pysqlite): Update to 2.8.1.
[source]: Change to `pypi uri` syntax.
[home-page]: Update to new homepage.

gnu: python2-backport-ssl-match-hostname: Update to 3.5.0.1.

* gnu/packages/python.scm (python2-backport-ssl-match-hostname):
Update to 3.5.0.1.
[arguments]: Skip tests.
[synopsis]: Update for python version 3.5.x.

gnu: python-cryptography: Update to 1.2.2.

* gnu/packages/python.scm (python-cryptography): Update to 1.2.2.
[source]: Change to `pypi uri` syntax.
[native-inputs]: Add python-pyasn1, python-pyasn1-modules,
python-hypothesis.
(python2-cryptography)[propagated-inputs]: Add
python2-backport-ssl-match-hostname

gnu: python-cryptography-vectors: Update to 1.2.2.

* gnu/packages/python.scm (python-cryptography-vectors): Update to 1.2.2.