Summary Gold seen as biggest winner from dollar diversification Euro seen top currency to benefit in short term - OMFIF survey Yuan favoured by central bankers over a longer time frame Reuters' sources see euro recovering some lost ground quickly Euro share of reserves likely to rise in next few years. LONDON, June 24 (Reuters) - The custodians of trillions of dollars of global central bank reserves are eyeing a move away from the greenback into gold, the euro and China's yuan as the splintering of world trade and geopolitical upheaval spark a rethink of financial flows. According to a...