President Sergio Mattarella called for rigorous Europe-wide action to battle anti-Semitism during a ceremony at the Quirinal Palace in Rome for Holocaust Remembrance Day on Tuesday.     "The recurrence and spread of manifestations of racism and anti-Semitism is an indication of a high level of danger and calls for rigorous action on the part of authorities throughout the European Union," the head of State said.     "In the (Italian) Republic, there is no place for the poison of racial hatred,