update FieldSelectorResult with a BREAK only result option. consolidate some of 
the state for break/load
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                 Key: LUCENE-2535
                 URL: https://issues.apache.org/jira/browse/LUCENE-2535
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Other
    Affects Versions: 3.0.2
            Reporter: Woody Anderson
            Priority: Minor
             Fix For: 3.0.2


some field storage strategies can be much improved by immediate break vs. the 
break-and-load currently provided.
this adds another break option, which makes it more advantageous to have member 
variables of the enum that indicate it's a break/load etc. vs. doing a bunch of 
grouped == checks.

The BREAK option should cause an early termination with include == false in the 
ParallelReader when the BREAK before any other field, then the document should 
not be loaded from that reader. This is fairly easy to validate with a test, 
which is included in the patch.

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