Missing British child Madeleine McCann’s parents have agreed to a DNA test for a Polish woman who believes she’s their daughter — though even representatives for the young woman making the stunning claims admit that her background is “messy.” Gerry and Kate McCann, whose 3-year-old daughter, Madeleine, disappeared on vacation in Portugal over 15 years ago, are following up on Julia Faustyna’s claims that she is the kidnapped toddler, a source told the Daily Beast this week. Faustyna, 21, became an internet sensation this month after she started posting on social media under the handle @iammadeleinemccann. Earlier this week, she...