Qt 5.9 released

Lars Knoll takes a lookat the Qt 5.9 LTS release. "With Qt 5.9, we have had a strong focus on performance and stability. We've fixed a large number of bugs all across Qt, and we have done a lot of work to improve our continuous integration system. This will make it a lot easier for us to create new releases (both patch level and minor releases) from 5.9 onward.We've also added automated performance regression testing to our testinginfrastructure, something that will allow us to continuously monitor ourwork on improving the performance of Qt." Qt 5.9 will be supportedfor three years.