Among the Sophia Loren films not included in “Sophia Loren: La Signora di Napoli,” a 13-film retrospective mounted by Film at Lincoln Center, is Melville Shavelson’s “Houseboat” (1958). The curatorial team responsible for this series — its members include Florence Almozini and Tyler Wilson from the host institution and their colleagues at Cinecittà, Paola Ruggiero, Camilla Cormanni, and Marco Cicala — have done well in their choices, with pictures culled from a period covering a whopping 66 years. Still, there’s a reason they didn’t pick “Houseboat.”