I have always admired what TimeLine Theatre Co. has done with the displays in their lobby at 615 W. Wellington Ave. in Lakeview, which supplement current productions with informative documents, photographs and interactive materials.For “Cardboard Piano,” running through March 17, Hansol Jung’s searing drama about the violent and torturous life in Uganda during the first years of this millennium, continues that tradition.They displayed news reports depicting the history of the Ugandan government’s …