change FunctionQuery to use ComplexExplanation
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         Key: SOLR-25
         URL: http://issues.apache.org/jira/browse/SOLR-25
     Project: Solr
        Type: Improvement

    Reporter: Hoss Man
 Attachments: complex-explaination.patch

LUCENE-605 added a new ComplexExplanation class to the Lucene core which allows 
for Explanations of queries which match documents with non-positive scores -- 
somethign that can happen quite a bit with FunctionQueries.

Here is a patch to make FunctionQuery take advantage of the new 
CompelxExplanation class if you are using a bleeding edge version of 
lucene-core.

This patch can be commited in Solr once we're ready to rev 
lib/lucene-core-nightly.jar again.

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