Refactor/Cleanup Lucene Spatial
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                 Key: LUCENE-2350
                 URL: https://issues.apache.org/jira/browse/LUCENE-2350
             Project: Lucene - Java
          Issue Type: Improvement
            Reporter: Grant Ingersoll


Lucene spatial needs a lot of work.  We should clean it up and allow for people 
to use different distances (i.e. don't assume Haversine), etc.  We should also 
merge the Solr and Lucene code into a single lib, where possible (starting w/ 
Distance Utils).   Update the distance filter to allow for pluggable distance 
measures. 

Also do things like not assume everything is in degrees (users may already 
store radians, for instance) and use constants for conversions/multiplications 
instead of division.

 End goal:  No more experimental status.  Clean up the APIs, use the more 
common nomenclature for "tiers" and be consistent across Lucene and Solr.

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