put missing GPL license block

Common/ColorTable.cpp

-// $Id: ColorTable.cpp,v 1.22 2004-05-13 17:06:05 geuzaine Exp $
+// $Id: ColorTable.cpp,v 1.23 2004-07-08 18:57:29 geuzaine Exp $
 //
 // Copyright (C) 1997-2004 C. Geuzaine, J.-F. Remacle
 //
-// This software is provided "as is" without express or implied warranty.
-// See the file "doc/LICENSE" for the licensing terms.
+// 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 2 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.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+// USA.
 // 
 // Please report all bugs and problems to <gmsh@geuz.org>.
 //