new package: py-pycifrw (#15224)

var/spack/repos/builtin/packages/py-pycifrw/package.py

+# Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class PyPycifrw(PythonPackage):
+    """Python library for interacting with Crystallographic Information
+    Framework (CIF) files."""
+
+    homepage = "https://bitbucket.org/jamesrhester/pycifrw/src/development/"
+    url      = "https://pypi.io/packages/source/P/PyCifRW/PyCifRW-4.4.1.tar.gz"
+
+    version('4.4.1', sha256='cef7662f475e0eb78a55c2d55774d474e888c96b0539e5f08550afa902cdc4e1')
+
+    depends_on('py-setuptools', type='build')