**_The beginning of cabin-in-the-woods horror, sort of_** Four college-aged youths go out to the woods north of Los Angeles to visit their professor’s cabin and have a picnic, but they stumble upon a grimoire and several malevolent creatures are inadvertently unleashed. “Equinox” mixes “Mysterious Island” (1961) with HP Lovecraft and the low-budget weirdness of, say, The Twilight Zone. It was originally made as “The Equinox... A Journey Into the Supernatural,” a 71-minute flick made for $6500 by Dennis Muren and Mark Thomas McGee in 1967. However, after impressing a producer, a director was…