Merge remote-tracking branch 'refs/remotes/origin/dev' into dev

src/writeheader_nest_surf.f90

+! SPDX-FileCopyrightText: FLEXPART 1998-2019, see flexpart_license.txt
+! SPDX-License-Identifier: GPL-3.0-or-later
+
 subroutine writeheader_nest_surf
 
   !*****************************************************************************

src/writeheader_surf.f90

+! SPDX-FileCopyrightText: FLEXPART 1998-2019, see flexpart_license.txt
+! SPDX-License-Identifier: GPL-3.0-or-later
+
 subroutine writeheader_surf
 
   !*****************************************************************************

src/writeheader_txt.f90

+! SPDX-FileCopyrightText: FLEXPART 1998-2019, see flexpart_license.txt
+! SPDX-License-Identifier: GPL-3.0-or-later
+
 subroutine writeheader_txt
 
   !*****************************************************************************

src/writeprecip.f90

+! SPDX-FileCopyrightText: FLEXPART 1998-2019, see flexpart_license.txt
+! SPDX-License-Identifier: GPL-3.0-or-later
+
 subroutine writeprecip(itime,imem)
 
   !*****************************************************************************

src/xmass_mod.f90

+! SPDX-FileCopyrightText: FLEXPART 1998-2019, see flexpart_license.txt
+! SPDX-License-Identifier: GPL-3.0-or-later
+
 module xmass_mod
   
   implicit none

src/zenithangle.f90

+! SPDX-FileCopyrightText: FLEXPART 1998-2019, see flexpart_license.txt
+! SPDX-License-Identifier: GPL-3.0-or-later
+
 real function zenithangle(ylat,xlon,jul)
 
   !*********************************************************************