***Pedestrian Grade B knockoff of “Friday the 13th”*** It’s the end of the season at a youth camp on the remote end of Long Island and a legendary mad backwoodsman appears on the final night to pick off the counselors. Gaylen Ross (as Alexis Dubin) from “Dawn of the Dead” (1978) appears as one of the protagonists. Seeing “Madman” (1981) makes you realize the excellence of “Friday the 13th” (1980). It has the same basic setting and plot with a promising opening that borrows from “The Fog” (1980), not to mention a crazy ax-wielding killer that recalls “The Shining” (1980). But it never ris...