Mostly some clean-up again, parentship between objects should now survive loading, saving as well as duplication and copy&paste. FileReader got a little const cleanup. The select tool nows properly selects only objects which are in it, instead of all things that collide with it. Object duplication now preserves layers, so that one can duplicate large groups of objects spread over many layers with ease. The LayerManager now provides show/hide all and lock/unlock all buttons, a auto-lock button is presented as well, limiting editing to the current layer.
Other then that, there are some more graphics that got moved over from the media/ area and the existing sectors got a little cleanup.