Spatial 0.25.5-neo4j-3.4.1

A patch to the 0.25.x series which includes two bug-fixes:

• a bug-fix to cases when the same node is added to both RTree based layers, as well as lucene index based layers (like geohash, zorder or hilbert). This fix also includes a behaviour change in that deleting layers will no longer default to deleting the geometry nodes. The requirement for that behaviour is long obsolete.
• a bug-fix for OSM importing where the OSM file does not contain changeset fields on the nodes

It should be noted that Neo4j 3.4.0 has included more enhanced support for native Point types inside the database itself. This library can understand those types, as it did with the earlier 3.0 Point type, but does not make any special use of the built-in Neo4j spatial features, except that the space filling curve algorithm is now the one included in Neo4j itself.