[Solr Wiki] Update of "SpatialSearchDev" by Christopher Gross

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The "SpatialSearchDev" page has been changed by Christopher Gross:
http://wiki.apache.org/solr/SpatialSearchDev?action=diff&rev1=6&rev2=7

Comment:
adding in dynamic field information for the _latLon field -- so that searching will work

  <fieldType name="latLon" class="solr.LatLonType" subFieldSuffix="_latLon"/>
  ...
  <field name="store_lat_lon" type="latLon" indexed="true" stored="true"/>
+ ...
+ <dynamicField name="*_latLon" type="double" indexed="true" stored="false" multiValued="true"/>
  }}}
  === Geohash ===
  A geohash is a way of encoding lat/lon into a single field as a String.  As of https://issues.apache.org/jira/browse/SOLR-1586, it will be possible to create a geohash via FieldType, simply by passing in a Point (lat,lon).  Solr will do the work of converting the point to a geohash.