SIENA, Italy (Reuters) - Enraged shareholders of Monte Paschi bank lashed out at its management on Friday as questions grew about central bank oversight of the historic lender following the uncovering of nearly $1 billion of losses in complex derivatives deals. The turmoil surrounding Italy's third-largest bank has rocked the country's financial establishment and exposed both the government and the Bank of Italy to difficult questions over how the risky deals could have been hidden from regulators. ...