By Denny Dyroff, Entertainment Editor, The Times Eleni Mandell Singer/songwriters have a wide, wide array of topics and experiences they use as inspiration for their songs. It’s safe to say that Eleni Mandell has tapped into a source probably never used before – teaching songwriting at a women’s prison. Mandell, who will headline a show on June 26 at the World Café Live (3025 Walnut Street,...