NEW YORK — U.S. stocks ended back where they started Friday as the stock market wrapped up its best quarter in almost five years. Electric car maker Tesla plunged after federal regulators moved to oust CEO Elon Musk following his tweet last month saying that he was close to a deal to take Tesla private.Health-care companies did better than any part of the market during the third quarter and they continued to rise Friday, while technology companies rose as chipmakers also traded [...]