fix some remaining license notice + add a missing LicenseRef-Commercial

Installation/include/CGAL/auto_link/auto_link.h

@@ -1,15 +1,13 @@
 // This header file is a copy of "boost/config/auto_link.hpp" 
 // from boost version 1.44.0
 // but slightly modified to accommodate CGAL libraries.
-
+//
 // Before CGAL-4.7-beta1, it has been synchronized with
 // libs/config/ version boost-1.58.0-39-g15d56c9, file
 // include/boost/config/auto_link.hpp
-
+//
 //  (C) Copyright John Maddock 2003.
-//  Use, modification and distribution are subject to the
-//  Boost Software License, Version 1.0. (See accompanying file
-//  LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
+//
 //
 // $URL$
 // $Id$

STL_Extension/include/CGAL/is_streamable.h

@@ -1,15 +1,6 @@
 // Copyright (c) 2012  GeometryFactory Sarl (France)
 // All rights reserved.
 //
-// Distributed under the Boost Software License, Version 1.0. (See accompanying
-// file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
-//
-// Licensees holding a valid commercial license may use this file in
-// accordance with the commercial license agreement provided with the software.
-//
-// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
-// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
-//
 // $URL$
 // $Id$
 // SPDX-License-Identifier: BSL-1.0

Surface_mesh/include/CGAL/Surface_mesh/Surface_mesh.h

@@ -6,7 +6,7 @@
 //
 // $URL$
 // $Id$
-// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
 //