| Added accessors for render quality on PCanvas (Issue 93) , and also wrote more tests to confirm that Issue 87 is fixed. | 
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| core/src/main/java/edu/umd/cs/piccolo/PCanvas.java | 
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| core/src/test/java/edu/umd/cs/piccolo/MockPropertyChangeListener.java | 
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| core/src/test/java/edu/umd/cs/piccolo/PCanvasTest.java | 
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| core/src/test/java/edu/umd/cs/piccolo/PNodeTest.java | 
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