TurtleSerializer.hs: improved serializer to the point that it correctly uses comma and semi-colon where possible, assuming triples are already in the correct order.
TurtleSerializer.hs: improved serializer to the point that it correctly uses comma and semi-colon where possible, assuming triples are already in the correct order.

darcs-hash:20071122001713-db1bb-f07a143b748d20c6c9d607d962a7239b17949f44

jutaro/rdf4h,LeifW/rdf4h,cordawyn/rdf4h,ddssff/rdf4h