MADRID (Reuters) - Spanish lender Bankia will ask the state for more than 15 billion euros (US$19 billion) to bail it out when its new management team presents a restructuring plan on Friday, a financial sector source said late on Thursday. Bankia, partially nationalized by the government earlier this month, is the weak spot in Spain's fragile banking system where loan losses stemming from a 2008 property crash threaten to push the country into seeking international assistance. ...