Mauricio Funes, a member of a political party that waged guerrilla war against the government 17 years ago, has claimed the presidency of El Salvador. “This is the happiest night of my life,” Funes told a jubilant crowd at his election headquarters Sunday night. “It’s also the night of greatest hope for El Salvador.” The FMLN party’s Funes had 51.12 percent of the vote, while the ARENA party’s Rodrigo Avila had 48.87 percent with 84 percent of the national ballots counted, the electoral commission said on its Web site