Apparently it's preferrable to be anything but black. One might think this revelation might encourage people to rethink their racist attitutudes, but by what I've read here, I'm not positive that'll happen.  - DG   DNA study seeks origin of Appalachia's Melungeons NASHVILLE, Tenn. (AP) — For years, varied and sometimes wild claims have been made about the origins of a group of dark-skinned Appala…