Add copying informations.

COPYING

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+Copyright 2006 - 2011 
+     Julien Baudry	<[email protected]>
+     Antoine Dutot	<[email protected]>
+     Yoann Pigné	<[email protected]>
+     Guilhelm Savin	<[email protected]>
+
+GraphStream is a library whose purpose is to handle static or dynamic
+graph, create them from scratch, file or any source and display them.
+
+This program is free software distributed under the terms of two licenses, the
+CeCILL-C license that fits European law, and the GNU Lesser General Public
+License. You can  use, modify and/ or redistribute the software under the terms
+of the CeCILL-C license as circulated by CEA, CNRS and INRIA at the following
+URL <http://www.cecill.info> or under the terms of the GNU LGPL 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+The fact that you are presently reading this means that you have had
+knowledge of the CeCILL-C and LGPL licenses and that you accept their terms.