Before, I was not a witch. But now I am one. — Margaret Atwood, author of Half-Hanged Mary and descendant of accused witch Mary Webster The Witch, described simply by its first time writer/director Robert Eggers as a “New England fairytale,” tells a story we’ve heard many times and in many different ways—but with one crucial difference. The ancient, devil-loving hag who wreaks havoc on good, devout Christians is, of course, a tale as old as most countries. More recently, though, it’s also been reapproriated to incorporate everything from Arthur Miller’s metaphorical scapegoats to the WB’s Halliwell sisters (and whatever the hell Strega Nona and…