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PLT Utilities: Updated NoDuplicatesIterator and FilteredIterator to support null elements (which were treated before as end-of-list sentinels).

Authored by: dlsmith 2009-08-24

Parent: [r5027]

changed	/trunk/plt/src/edu/rice/cs/plt/iter/FilteredIterator.java
changed	/trunk/plt/src/edu/rice/cs/plt/iter/NoDuplicatesIterator.java
changed	/trunk/plt/src/edu/rice/cs/plt/iter/NoDuplicatesIteratorTest.java