Add SPDX metadata for Python files originally written at EMBL

Copyright ownership is EMBL for the time that I was working there,
and Christopher Kerr thereafter.

setup.py

 #!/usr/bin/env python
 
+# SPDX-FileCopyrightText: 2016-2017 European Molecular Biology Laboratory (EMBL)
+# SPDX-FileCopyrightText: 2018-2019 Christopher Kerr
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
 from numpy.distutils.core import setup as np_setup
 from numpy.distutils.extension import Extension as F2PyExtension
 

src/python/__init__.py

+# SPDX-FileCopyrightText: 2016 European Molecular Biology Laboratory (EMBL)
+# SPDX-FileCopyrightText: 2018 Christopher Kerr
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
 __copyright__ = "European Molecular Biology Laboratory (EMBL)"
 __license__ = "LGPLv3+"
 

src/python/atomicscattering.py

+# SPDX-FileCopyrightText: 2016 European Molecular Biology Laboratory (EMBL)
+# SPDX-FileCopyrightText: 2017-2019 Christopher Kerr
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
 __copyright__ = "European Molecular Biology Laboratory (EMBL)"
 __license__ = "LGPLv3+"
 

src/python/intensity.py

+# SPDX-FileCopyrightText: 2016 European Molecular Biology Laboratory (EMBL)
+# SPDX-FileCopyrightText: 2017-2018 Christopher Kerr
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
 __copyright__ = "Christopher Kerr"
 __license__ = "LGPLv3+"
 

src/python/sphericalbessel.py

+# SPDX-FileCopyrightText: 2016 European Molecular Biology Laboratory (EMBL)
+# SPDX-FileCopyrightText: 2017-2019 Christopher Kerr
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
 __copyright__ = "European Molecular Biology Laboratory (EMBL)"
 __license__ = "LGPLv3+"
 

src/python/sphericalharmonic.py

+# SPDX-FileCopyrightText: 2016 European Molecular Biology Laboratory (EMBL)
+# SPDX-FileCopyrightText: 2017-2019 Christopher Kerr
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
 __copyright__ = "European Molecular Biology Laboratory (EMBL)"
 __license__ = "LGPLv3+"
 

test/test_atomic_scattering.py

+# SPDX-FileCopyrightText: 2016 European Molecular Biology Laboratory (EMBL)
+# SPDX-FileCopyrightText: 2018-2020 Christopher Kerr
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
 from hypothesis import assume, given, settings
 import hypothesis.strategies as st
 import hypothesis.extra.numpy as npst

test/test_bessel.py

 """Tests for the spherical bessel functions."""
 
+# SPDX-FileCopyrightText: 2016 European Molecular Biology Laboratory (EMBL)
+# SPDX-FileCopyrightText: 2018-2020 Christopher Kerr
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
 from hypothesis import assume, given, settings
 import hypothesis.strategies as st
 import hypothesis.extra.numpy as npst

test/test_intensity.py

+# SPDX-FileCopyrightText: 2016 European Molecular Biology Laboratory (EMBL)
+# SPDX-FileCopyrightText: 2018-2020 Christopher Kerr
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
 from hypothesis import assume, given, HealthCheck, settings
 import hypothesis.strategies as st
 import numpy as np

test/test_sphharm.py

+# SPDX-FileCopyrightText: 2016 European Molecular Biology Laboratory (EMBL)
+# SPDX-FileCopyrightText: 2017-2020 Christopher Kerr
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
 from hypothesis import assume, example, given, settings
 import hypothesis.strategies as st
 import hypothesis.extra.numpy as npst