SPRINGFIELD — The state’s top court will look into an open records dispute stemming from the probe of a fatal sidewalk altercation involving former mayor Richard M. Daley’s nephew, Richard J. Vanecko.The Illinois Supreme Court this morning agreed to take up the case of whether documents related to Dan K. Webb’s grand jury investigation into David Koschman’s death are exempt from state transparency laws.The high court today also agreed to hear appeals in an inter-city dispute over sales tax …