Add py-quantities

Add py-quantities, which is a dependency for py-neo. This same version is available in upstream Spack, adding it here in case we need to add new versions quickly

packages/py-quantities/package.py

+# Copyright 2013-2022 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 PyQuantities(PythonPackage):
+    """Support for physical quantities with units, based on numpy"""
+
+    homepage = "https://python-quantities.readthedocs.org"
+    pypi = "quantities/quantities-0.12.1.tar.gz"
+    maintainers = ['apdavison']
+
+    version('0.13.0', sha256='0fde20115410de21cefa786f3aeae69c1b51bb19ee492190324c1da705e61a81')
+    version('0.12.5', sha256='67546963cb2a519b1a4aa43d132ef754360268e5d551b43dd1716903d99812f0')
+    version('0.12.4', sha256='a33d636d1870c9e1127631185d89b0105a49f827d6aacd44ad9d8f151f331d8b')
+    version('0.12.3', sha256='582f3c7aeba897846761e966615e01202a5e5d06add304492931b05085d19883')
+    version('0.12.2', sha256='92e8397938516483f4fd1855097ec11953ab10dd0bf3293954559226679f76f0')
+    version('0.12.1', sha256='0a03e8511db603c57ca80dee851c43f08d0457f4d592bcac2e154570756cb934')
+    version('0.11.1', sha256='4382098a501b55bf0fdb3dba2061a161041253697d78811ecfd7c55449836660',
+            url="https://pypi.io/packages/source/q/quantities/quantities-0.11.1.zip")
+
+    conflicts('^py-numpy@1.13:', when='@:0.11')
+
+    depends_on('python@2.6:2.7,3.3:3.4', type=('build', 'run'), when='@:0.11')
+    depends_on('python@2.7.0:2.7,3.4:3.6', type=('build', 'run'), when='@0.12.0:0.12.2')
+    depends_on('python@2.7.0:2.7,3.4:3.7', type=('build', 'run'), when='@0.12.3')
+    depends_on('python@2.7.0:2.7,3.4:3.8', type=('build', 'run'), when='@0.12.4:0.12.5')
+    depends_on('python@3.7:3.10', type=('build', 'run'), when='@0.13:')
+
+    # pip silently replaces distutils with setuptools
+    depends_on('py-setuptools', type='build')
+
+    depends_on('py-numpy@1.7.1:1.9', type=('build', 'run'), when='@:0.11')
+    depends_on('py-numpy@1.8.2:1.13', type=('build', 'run'), when='@0.12.0:0.12.1')
+    depends_on('py-numpy@1.8.2:1.14', type=('build', 'run'), when='@0.12.2')
+    depends_on('py-numpy@1.8.2:1.16', type=('build', 'run'), when='@0.12.3')
+    depends_on('py-numpy@1.8.2:1.17', type=('build', 'run'), when='@0.12.4:0.12')
+    depends_on('py-numpy@1.16:', type=('build', 'run'), when='@0.13.0:')