Saudi prince makes bold challenges to kingdom's old ways

By Samia Nakhoul, William Maclean and Angus McDowall RIYADH (Reuters) - Saudi Deputy Crown Prince Mohammed bin Salman got a standing ovation when he visited a gathering of Saudi youth last month. Prince Mohammed works 16-hour days -- unlike the more sluggish schedules of his older predecessors -- and has appointed business people and economic experts instead of other royals to top jobs.     Many younger Saudis see the rise of a man who is usually referred to as "MbS" as evide