A legal tussle over copyrights to photos from the 1950s onward shot by a Chicago nanny profiled in an Oscar-nominated documentary appeared close to a resolution Tuesday — though a dispute about who is Vivian Maier’s rightful heir remains unresolved.John Maloof, who is credited with discovering the photos and who co-directed “Finding Vivian Maier,” told The Associated Press he and Cook County’s public administrator’s office have reached a tentative agreement after a year of negotiations …