Add SPDX metadata to the OpenCL source

src/opencl/alm-add-atom.cl

 /*
- * Copyright (c) European Molecular Biology Laboratory (EMBL)
+ * Copyright (c) European Molecular Biology Laboratory
+ * SPDX-FileCopyrightText: 2016 European Molecular Biology Laboratory (EMBL)
+ *
+ * SPDX-License-Identifier: LGPL-3.0-or-later
  *
  * This file is part of GALUMPH.
  *

src/opencl/intensity.cl

 /*
- * Copyright (c) European Molecular Biology Laboratory (EMBL) 2016-7
- * Copyright (c) Christopher Kerr 2018
+ * Copyright (c) European Molecular Biology Laboratory, Christopher Kerr
+ * SPDX-FileCopyrightText: 2016 European Molecular Biology Laboratory (EMBL)
+ * SPDX-FileCopyrightText: 2018 Christopher Kerr
+ *
+ * SPDX-License-Identifier: LGPL-3.0-or-later
  *
  * This file is part of GALUMPH.
  *

src/opencl/rotate-alm.cl

 /*
- * Copyright (c) 2018 Christopher Kerr
+ * Copyright (c) Christopher Kerr
+ * SPDX-FileCopyrightText: 2018 Christopher Kerr
+ *
+ * SPDX-License-Identifier: LGPL-3.0-or-later
  *
  * This file is part of GALUMPH.
  *

src/opencl/spherical-bessel.cl

 /*
- * Copyright (c) European Molecular Biology Laboratory (EMBL)
+ * Copyright (c) European Molecular Biology Laboratory, Christopher Kerr
+ * SPDX-FileCopyrightText: 2016 European Molecular Biology Laboratory (EMBL)
+ * SPDX-FileCopyrightText: 2019 Christopher Kerr
+ *
+ * SPDX-License-Identifier: LGPL-3.0-or-later
  *
  * This file is part of GALUMPH.
  *

src/opencl/spherical-harmonic.cl

 /*
- * Copyright (c) European Molecular Biology Laboratory (EMBL)
+ * Copyright (c) European Molecular Biology Laboratory, Christopher Kerr
+ * SPDX-FileCopyrightText: 2016 European Molecular Biology Laboratory (EMBL)
+ * SPDX-FileCopyrightText: 2018-2019 Christopher Kerr
+ *
+ * SPDX-License-Identifier: LGPL-3.0-or-later
  *
  * This file is part of GALUMPH.
  *

src/opencl/translate-alm.cl

 /*
- * Copyright (c) 2018 Christopher Kerr
+ * Copyright (c) Christopher Kerr
+ * SPDX-FileCopyrightText: 2018 Christopher Kerr
+ *
+ * SPDX-License-Identifier: LGPL-3.0-or-later
  *
  * This file is part of GALUMPH.
  *