Mike Aquino, CEO of Overture Networks, says his company's reported $35 million buyout by German technology giant ADVA Optical Networking is a good exit for investors, including Durham-based Intersouth Partners. That's in spite of the raw numbers. According to disclosure statements filed with the U.S. Securities and Exchange Commission, Overture Networks has raised more than $100 million over the years from various investors. Only one of those funders, a round for $8.4 million in 2013, was...