Some advance warning: Coldplay, the dreariest band in the entire world, might be about to get considerably drearier. And it’s all Gwyneth Paltrow’s fault. Tucked away at the bottom of a New York Daily News article about how many molecules of mashed potato she briefly considered touching with her tongue yesterday - or whatever - came the news that Gwyneth Paltrow’s marriage to Chris Martin is ‘on a break’ and that she’s spending a lot of time with an American real estate billionaire named Jeff