So European leaders finally got their act together and catastrophe was avoided over Greenland, writes Anne McElvoy from Davos. But in Trumpworld, anything can happen and unhappen – and Europe is still left with a major headache: How far can it indulge his next wild plan? D onald Trump’s cavalcade rolled into the Swiss Alps with two competing messages for the business and tech titans and politicians gathered in Davos. The first was Trump’s latest idee fixe – namely that the US needs to “have