2012/08    fixed bugs in handling of nodal covariates and cast same as sender, receiver or social. 
2012/08    working startup message. 
2012/08    fixed V_xi_e and V_psi2_e update bug (thanks to Sebastian Leist). 
2012/07    changed to mclustBIC in vblpcmstart function for compatibility with mclust 4. 
