**Acknowledgements**

The support of FONDECYT (Preis 3140076, Preis 1140239 and Preis 1120764), FONDEF (Preis IT13I10034), CORFO (Preis 14BPC4‐28651), USACH‐DICYT ASOCIATIVO, SEP‐PROMEP Preis 14146 F‐38, and UTFSM‐DGIP, CONICYT‐PCHA/Doctorado Nacional 201363130065, is gratefully acknowledged. Some parts of the chapter are part of the previously published papers [18, 21, 22].
