Acknowledgements

The Portuguese Foundation for Science and Technology (FCT) is acknowledged through the projects PTDC/AGR-TEC/4814/2014, UID/QUI/UI0313/2013, and POCI-01-0145-FEDER-07630. FCT is also acknowledged through the researcher grants IF/01005/2014, SFRH/BPD/103086/ 2014, and SFRH/BPD/84112/2012 financed by POPH-QREN and subsidized by the European Science Foundation.
