Registration for the Thematic School is now closed. We apologize for that but we have reached the limit size of the meeting room and the maximal capacity of the place where midday meals are to be taken.. To register, you must first create an account (mathematicians holding a position in France may use their PLM-Mathrice account if they have one ; other participants have to create their own account). You will then receive an e-mail asking for confirmation for the creation of your account (caution: depending on the mail settings at your home institution, this may take one or two days). After following the procedure indicated in the e-mail, you will be able to register. We deeply apologize for this somewhat complicated procedure. Because of some of our sponsors' regulations, we are obliged to set up a mandatory registration. Moreover the thematic school website is hosted by a server of the Institute for Mathematics and its Interactions (INSMI) of the French National Centre for Scientific Research (CNRS) devoted to mathematical conferences, and the registration procedure is a standardized one, that has not been specially designed for our workshop. Do not hesitate to contact us in case you meet any problem during the registration procedure. Please note that applications for financial support for Ph. D students or young researchers are now closed.