Federal Reserve Chairman Kevin Warsh has added two more key advisors as he seeks to remake how the central bank approaches its views on the economy and monetary policy, people familiar with the moves confirmed to CNBC. Though Warsh has talked about broad changes that need to be made at the Fed, he instead reached inside for these appointments, naming economists Daniel Covitz and Eric Engstrom to the posts. Covitz is one of three deputy directors in the research and statistics division while