Improve Spatial Utility like classes
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                 Key: LUCENE-2147
                 URL: https://issues.apache.org/jira/browse/LUCENE-2147
             Project: Lucene - Java
          Issue Type: Improvement
          Components: contrib/spatial
    Affects Versions: 3.1
            Reporter: Chris Male


- DistanceUnits can be improved by giving functionality to the enum, such as 
being able to convert between different units, and adding tests.  

- GeoHashUtils can be improved through some code tidying, documentation, and 
tests.

- SpatialConstants allows us to move all constants, such as the radii and 
circumferences of Earth, to a single consistent location that we can then use 
throughout the contrib.  This also allows us to improve the transparency of 
calculations done in the contrib, as users of the contrib can easily see the 
values being used.  Currently this issues does not migrate classes to use these 
constants, that will happen in issues related to the appropriate classes.

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