Since its inception in 1999, the motto of the Provincetown Film Festival has been “filmmaking on the edge,” a reference to its celebration of independent film projects and to its geographical location at land’s end on Cape Cod, Mass. The 19th iteration of the festival, which takes place June 14-18, shows that its commitment to artistic-minded fare remains not only intact, but even stronger than ever, thanks to a remarkable array of films, of which half of the narrative features were directed by women — a first in festival history.