FRANKFURT (Reuters) – All things to all people, the U.S. dollar leaves its imprint in every corner of the global economy: It is the currency in which vital raw materials are bought and sold, and it is the safe haven to which investors turn in times of trouble. The greenback is now at a 20-year high against other world currencies, thanks in part to expectations that the Federal Reserve will increase its interest rates faster than most. Here are 10 reasons why you should be paying attention: AMERICAN ABROAD – A strong dollar is great if you are a U.S. tourist. Hotels, meals or a designer bag all…