LONDON, Feb 2 : The dollar clung on to gains on Monday as investors weighed what a Federal Reserve under Kevin Warsh might look like, while plunging precious metals and oil prices weighed on commodity-linked currencies. The slide in commodities spilled over into equity markets in Asia and Europe, marking a nervous start to the week filled with central bank meetings and top-tier economic data, as well as an election in Japan. The yen was back on traders' radars, after Japanese Prime Minister