Poly[(5,6-?dihydro-?5-?octyl-?4,6-?dioxo-?4H-thieno[3,4-c]?pyrrole-?1,3-?diyl)?[4,8-?bis[(2-?ethylhexyl)?oxy]?benzo[1,2-b:4,5-b?]dithiophene-2,6-diyl]]