By Gregor Stuart Hunter SINGAPORE (Reuters) -The surge in gold prices above $4,000 per ounce is spilling over into other precious metals on fears the Trump administration's unorthodox economic policies will shift the prevailing trend from de-dollarisation to outright debasement of the U.S. currency. Silver, platinum and palladium are enjoying upsized gains for the year as investors fret about a whole host of geopolitical and economic uncertainties, with U.S. President Donald Trump's attempts to reshape g ...