Comments: It has been a great pleasure for me to have worked with "philippg" Some very fruitful discussions took place between us during the execution of this project and the pleasant ambiance of understanding and mutual respect to the opinions and arguments of the counterpart, along the entire time that our work lasted, was one of the main keys to achieve a better quality for the final product of our collaboration. Frankly, I consider that it is worthwhile for anyone to work jointly with "philippg" in a project of this sort.