ATLANTA — Suspected illegal immigrants in Georgia are suffering from a “systemic violation ... of civil and human rights” during their confinement in “substandard” federal immigration detention facilities, including North Georgia Detention Center in Gainesville, according to a new report by the state’s chapter of the American Civil Liberties Union. The 182-page report released Wednesday immediately added fuel to the hot-burning debate over illegal immigration in the state, where the presence of an estimated 500,000 illegal immigrants, the seventh-largest population in the nation, has transformed large swaths of both cities and countryside. The North Georgia Detention Center is a 502-bed facility at 622 Main St. that has been under the management of Corrections Corp. of America since 2009.