Copyright 2010 Julio Trevisan, Plamen P. Angelov & Francis L. Martin. e-mailing author: j.trevisan@lancaster.ac.uk This program 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. This program 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. A copy of the GNU General Public License is shipped along with this program (filename: "COPYING"). For an online version of the license, see <http://www.gnu.org/licenses/>.