ENH: add code copyright

Copyright/CodeCopyright.txt

+/*=========================================================================
+
+  Program:   Monteverdi2
+  Language:  C++
+
+
+  Copyright (c) Centre National d'Etudes Spatiales. All rights reserved.
+  See Copyright.txt for details.
+
+  Monteverdi2 is distributed under the CeCILL licence version 2. See
+  Licence_CeCILL_V2-en.txt or
+  http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt for more details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even
+  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+  PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/