Proper names abbrevations

We need better algorithm for last names abbrevation because some of them are to be put in authors index, the cover and the authors index.

For instance:

• Gustavo Medina Toledo —> Medina Toledo, G.

• Roberto da Silva -> da Silva, R.

• Grégory Jevardat de Fombelle -> Jevardat de Fombelle, G.

• Luis Manuel Sarro Baro –> Sarro Baro, L. M.

• Jean-François Le Borgne –> Le Borgne (le Borgne?) J-F. J.-F. or J. F.

• Hans Van Winckel –> van Winckel, H.

• De France T.

• El Youssoufi D.

• El Jariri Y.

We need something to \author to make thing understood and stable. Perhaps \author{Gustavo {Medina Toledo}} would be enough.

More, last names like da Silva should be sorted as Silva, da At least according to Chicago Manual of Style (which I think it is because I don't have a copy).