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[FIX] maybe fixed the graphics engine problem on OSX, but added information output to debug the code until I am sure it works.

[ADD] we can now drag pictures (.png, .jpg, … whatever qt supports) to the transfer function widget and it creates the color function based on the first line of the picture's RGBA values. This works, e.g., with 3DSlicers transfer function preset pictures.

[ADD] - refactored WProperties. Now, we have a group base class WPropertyGroupBase. WPropertyGroup and WPropertyStruct derive from this and can, therefore, reuse all the thread-safe property-list management. WProperties is now an alias to WPropertyGroup.

[CHANGE] - WThreadedRunner now offers a exception callback mechanism. You can subscribe to this callback and get notified about crashed threads.

[FIX] quick fix for commit 5416: WApplication causes a crash on X11-based platforms, reverted to QApplication.

[CHANGE] removed code that is no longer needed that referred to the old way transfer functions are handled and did not work anymore due to the new transfer function infrastructure.

[FIX] OSX at least ensures that the .owproj extension is present if neither .owp nor .owproj is provided. This lead to some awkward file names.

[ADD] - added new type of property which will be able to represent a fixed number of other properties. In contrast to groups, this allows construction of more complex properties using the standard property types.

[FIX] - definition of external symbols must not be static. Additionally, the name in the definition of this symbol was wrong.