An Italian judge ruled on Tuesday that Raoul Weil, the ex-UBS banker wanted in the United States over allegations of helping Americans dodge taxes, must remain in custody while awaiting possible extradition, a judicial source said.  The decision was taken by a judge of the Court of Appeal in Bologna, where Weil, a Swiss citizen and former head of UBS’s global wealth management business, was arrested by Italian police on Saturday.  Dealings with UBS were spelled out in detail in US Senate hearings in 2008.  If the US is going to go after assets hidden in other countries, will legitimate revenue at last go into the coffers of the country of origin?