Copyright (C) 2008, 2015 SES ENGINEERING, Luxembourg S.A.R.L. This file is part of SPELL. SPELL is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. SPELL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with SPELL. If not, see <http://www.gnu.org/licenses/>. Comments are welcome.