- fix compile error after qpointer change
- allow new layout items to be moved
- simplify code
- hide playback controls, when there is no data.
- wait for autolayout to conclude before closing window
- use single shot timer to ensure that the layout is stopped
Fixed Bug 1943. The attribute is useValuesfromTriggerTime is now always
written out for Level 3 whereas it has to remain conditional in L2V4.