Acknowledgements
This work has been funded by research project CGL2011-22728 of the Dirección General de Programas y Transferencia del Conocimiento (Spanish Ministry of Science and Innovation), as part of the National Program of Projects in Fundamental Research, in the frame of the VI National Plan of Scientific Research, Development and Technologic Innovation 2008-2011. JGB appreciates financial support by the Spanish Ministry of Science and Innovation through the Ramón y Cajal program. Access to LANSCE (HIPPO) to perform texture measurements, and help of Sven Vogel was invaluable. We are grateful to M. Voltolini and M. Zucali for thorough and constructive reviews and to M. Zucali for the editorial work and the invitation to participate in this volume.