AISLINN LAING and FABIAN CAMBERO CHILEANS poured into the country's main squares on Sunday night after voters gave a ringing endorsement to a plan to tear up the country's Pinochet-era constitution in favour of a new charter drafted by citizens. In Santiago's Plaza Italia, the focus of the massive and often violent social protests last year which sparked the demand for a new Magna Carta, fireworks rose above a crowd of tens of thousands of jubilant people singing in unison as the word "rebirth" was beamed onto a tower above. With more than three quarters of the votes counted, 78.12%…