| Issue 217; adding/replacing license headers | 
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| core/src/main/java/org/piccolo2d/util/PAffineTransformException.java | 
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| examples/src/main/java/org/piccolo2d/examples/P3DRectExample.java | 
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| examples/src/main/java/org/piccolo2d/examples/pswing/PSwingExample4.java | 
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| extras/src/main/java/org/piccolo2d/extras/pswing/PSwingEvent.java | 
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| extras/src/main/java/org/piccolo2d/extras/pswing/PSwingMouseWheelEvent.java | 
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