HAVANA (Reuters) - With his picture on rock band posters, baseball caps and women's lingerie, Marxist revolutionary Che Guevara is firmly entrenched in the capitalist consumer society that he died fighting to overturn. The image of the Argentine-born guerrilla gazing sternly into the distance, long-hair tucked into a beret with a single star, has been an enduring 20th century pop icon. The picture -- taken by a Cuban photographer in 1960 and printed on posters by an Italian publisher after Guevara's execution in Bolivia seven years later -- fired the imagination of rioting Parisian students in May 1968 and became...