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This work was supported by FEDER funding via Programa Operacional Factores de Competitividade – COMPETE and Portuguese national funding by Fundac¸a˜o para a Cieˆncia e Tecnologia (FCT) in the scope of the following grants: PTDC/SAU-GMG/098850/2008, PTDC/SAU-NEU/099440/2008, PTDC/NEU-NMC/ 0750/2012, PTDC/SAU-NMC/12144/2010, PTDC/NEU-SCC/1351/2012 and PEst-C/SAU/LA0001/2013-2014. J.F. and M.V. received PhD grants from FCT (SFRH/BD/ 62600/2009 and SFRH/BD/47739/2008, respectively).