By Rich McKay ATLANTA (Reuters) – Americans on Monday were lining up yet again to buy Powerball tickets, dreaming of winning a $1.9 billion lottery jackpot that had jumped to a record high after repeated drawings failed to produce a winner. Saturday’s drawing was the 40th in a row without someone winning the top prize, which grows larger each time the jackpot goes unclaimed. To win, a ticket holder must match all six numbers drawn. If someone has a ticket matching all the numbers drawn on Monday, the winner can choose either a one-time lump sum of $929.1 million in cash, or multimillion-dollar…