moving GDMLtoGM replicas to use GeoSerialTransformer instead of single positioners.
N.B. this is exploratory work to figure out how to best utilise serial transformes in GeoModelXML, I'd rather not merge at the time.
N.B. this is exploratory work to figure out how to best utilise serial transformes in GeoModelXML, I'd rather not merge at the time.
