Four boats seized by US authorities from imprisoned swindler Bernard Madoff and his right-hand man, Frank DiPascali, sold for nearly $2 million at auction on Tuesday, the US Marshals Service said.A 61-foot (19-metre) Viking Convertible motor yacht that once belonged to DiPascali, Madoff's chief financial officer, brought the highest price - $950,000, the Marshals Service said.Madoff's 55-foot (17-metre)...