THE POND: PUERTO RICO'S 19TH CENTURY MASTERPIECE - Manuel Zeno GandíaBefore the turn of the century, while the rich in Madrid, Paris and Rome capped their sumptuous dinners with sips of Puerto Ricos exquisite black caf, the anemic men, women and children who harvested the precious crop lived in squalid huts and rarely saw a scrap of meat. Brutalized by grinding poverty, theirs was the harsh world of Manuel Zeno Gandias La Charca, published in 1894 and widely acknowledged as the first major novel to emerge from Puerto