This is my final project for my Intermediate Term at Think Tank Online. There have been days where I thought I wouldn't be able to finish it... with my work and my family, I slept very little for many weeks! Even if much more can still be done, I am quite happy with the result. I think I'll keep working on it in the future. Just like the last time, my son wanted to add his personal contribution! Thanks a lot to my supervisor Magnus Skagerlund for his precious advices and criticisms and to my family that always supported me!