[neon] qt 5.6.0 usedition testing

ahoy We are currently looking at integrating Qt 5.6.0 as Qt 5.6.1's release was pushed into later this month. Before we land it by default we'd like to do some testing. If you are using the user edition tech preview you can add a testing repository and do an update to get Qt 5.6.0 and a bunch of Plasma updates. Beware that this might entirely break your system, so only do this if you are comfortable with potentially repairing the system by hand or have nothing much to lose. sudo add-apt-repository http://archive.neon.kde.org/tmp/testing sudo apt update sudo apt dist-upgrade If you are using one of the developer editions you will probably get Qt 5.6.0 as an update some time this week, once we are confident it won't break everything and the kitchen sink. HS