SAN FRANCISCO (Reuters) - A lawyer convicted of stealing settlement money from vulnerable clients, including $250,000 from a brain-damaged infant, was sentenced on Tuesday to more than 14 years in prison, prosecutors said.Nikolai Tehin, 58, of San Francisco, was found guilty last October in the embezzlement of more than $2 million from his clients' settlement packages."This is the most severe sentence I've ever received from a federal court judge," Tehin's attorney, Harold Rosenthal, said in a telephone interview.During years defending people in medical malpractice and personal injury cases, Tehin would regularly deposit settlement checks into his firm's account and not...