merge in groundwork branch
this creates a plasma-overlay app with its own corona and view

it'll start up fine and load a default desktop containment + folderview
however, once it's hidden you can't bring it back - you have to kquitapp plasma-overlay
the lockprocess will run plasma-overlay when the screensaver starts, but also fails to stop it, and it gets created *under* the screensaver

I'm sure there are a bazillion other bugs - but it does run, and you can add widgets. :)