#42 Save on Closing altered scenes

[Bertram Herzog]

If a scene is altered and "close" is chosen, there is
no question if you want to save the changes.

After changing a labelmap in the Editor sometimes it
asks, if a saving should be performed when "Close" is
chosen. ("The image data for the following volumes are
unsaved: *Name of the labelmap* Exit anyway? Yes No"),

If newly created models are not saved, no question is
asked on saving (according to him)