Fixes in RDF support for geo shapes:
--- proper calculation of serialization lengths of complex shapes, to prevent possible memory corruptions on vectored operations
--- fix in parsing long polygon with multiple rings and very long ring in the middle of the list of inner rings
--- better support for polygons with inner rings in ST_Intersects
--- SPARQL ISNERT and SPARQL DELETE operations can now calculate shapes and use them as objects of the constructed triples