Ensure spatial nodes are added explicitly to spatial index to enable cypher querying

[jejking]

Given https://github.com/neo4j-contrib/spatial/issues/106 it seems necessary to add spatial nodes explicitly to the index associated with a layer and not just to the layer itself.

Also cf the discussion at http://stackoverflow.com/questions/17966722/neo4j-spatial-withindistance-cypher-query-returns-empty-while-rest-call-return

Otherwise the index returns an empty set, eg. for our test case START n=node:GEO('withinDistance:[53.xxxx, 10.xxx, 0.5]') RETURN n where we get an empty set after creating the gazetteer whereas we should get lots of streets and other things.

[jejking]

Test code shows that in fact SpatialRecordHits does not iterate correctly. For example, I can find 53 hits in a bounding box but the iterator returns nothing - but it is clear from the debugger that the underlying SpatialDatabaseRecord list looks quite correct.

[jamilabreu]

+1 to this :)