Crystal Chemistry and Physical Properties of Superconducting and Semiconducting Charge Transfer Salts of the Type (BEDT-TTF) 4 [A I M III (C 2 O 4 ) 3 ]·PhCN (A I = H 3 O, NH 4 , K; M III = Cr, Fe, Co, Al; BEDT-TTF = Bis(ethylenedithio)tetrathiafulvalene)