Add a field-filtering FilterAtomicReader to 4.0 so ParallelReaders can be 
better tested (in LTC.maybeWrapReader)
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                 Key: LUCENE-3823
                 URL: https://issues.apache.org/jira/browse/LUCENE-3823
             Project: Lucene - Java
          Issue Type: Improvement
          Components: core/index, general/test
    Affects Versions: 4.0
            Reporter: Uwe Schindler
            Assignee: Uwe Schindler
             Fix For: 4.0


In addition to the filters in contrib/misc for horizontally filtering (by 
doc-id) AtomicReader, it would be good to have the same vertically (by field). 
For now I will add this implementation to test-framework, as it cannot stay in 
contrib/misc, because LTC will need it for maybeWrapReader.

LTC will use this FilterAtomicReader to construct a ParallelAtomicReader out of 
two (or maybe more) FieldFilterAtomicReaders.

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