| adding license headers for extras and swt unit tests | 
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| extras/src/test/java/edu/umd/cs/piccolox/PAppletTest.java | 
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| extras/src/test/java/edu/umd/cs/piccolox/PFrameTest.java | 
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| extras/src/test/java/edu/umd/cs/piccolox/handles/PHandleTest.java | 
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| extras/src/test/java/edu/umd/cs/piccolox/pswing/PComboBoxTest.java | 
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| swt/src/test/java/edu/umd/cs/piccolox/swt/PSWTBoundsHandleTest.java | 
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| swt/src/test/java/edu/umd/cs/piccolox/swt/PSWTCanvasTest.java | 
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| swt/src/test/java/edu/umd/cs/piccolox/swt/PSWTHandleTest.java | 
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| swt/src/test/java/edu/umd/cs/piccolox/swt/PSWTImageTest.java | 
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| swt/src/test/java/edu/umd/cs/piccolox/swt/PSWTTextTest.java | 
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