The 2017 Provincetown Intl. Film Festival provides as diverse a showcase for short films as it does for narrative features and documentaries. No fewer than four short film programs are featured this year, including queer shorts by male and female directors and a New England series devoted to, as artistic director Lisa Viola says, “films that are regionally made, both in terms of subject and where the filmmakers live.” The expansive spotlight is due to the festival’s belief that short films can be a calling card for developing filmmakers.