BlackRock, the nation’s largest exchange-traded fund purveyor, said Wednesday that exchange-traded funds that invest in gold generated $4.8 billion in net new assets in November. That meant gold outperformed any other category of ETF, including fund that invest in bonds or stocks…….The rush to gold reflected increasing investor concern that gold is a safer place to put money than currencies or sovereign debt, given the European debt crisis and the high deficit and debt levels in the United States, according to Kevin Feldman, managing director for the iShares line of exchange-traded products from BlackRock.