update header file for license and copyright

Could you update all the file headers with a newest one You can find an example at gitlab.esrf.fr/limagroup/Lima/LIMA_GPL_HEADER.cpp.txt. or just copy the example below.

All files should be updated: .h .cpp .py and CMakeLists.txt

//###########################################################################
// This file is part of LImA, a Library for Image Acquisition
//
// Copyright (C) : 2009-2020
// European Synchrotron Radiation Facility
// CS40220 38043 Grenoble Cedex 9
// FRANCE
//
// Contact: lima@esrf.fr
//
// This 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 software 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, see <http://www.gnu.org/licenses/>.
//###########################################################################