The Boston Film Festival, which opens in two weeks, is being cut to half its usual length. “Festival organizers say the abbreviated schedule will be a one-year phenomenon — a nod to the nationwide decline in box office receipts, and an acknowledgment that the festival itself is in transition. Mark Diamond and Susan Fraine, former Loews executives who had run the festival since 1993, handed over the duties this year to Robin Dawson, executive director of the independent Massachusetts Film Bureau.”