Boeing on Monday sweetened a contract offer and said it was its "best and final" proposal for its more than 30,000 machinists as their strike, which has halted most of the aerospace giant's aircraft production, entered its second week.The new offer raised pay, reinstated annual bonuses and increased a bonus that would be given upon the contract's ratification, among other changes, Boeing said on its website.Boeing's new offer would raise general wages by 30% over four years, up from a previously proposed 25 ...