fix up chipper::Block constructor
fix up chipper::Block constructor

jwomeara/PDAL,jwomeara/PDAL,verma/PDAL,verma/PDAL,boundlessgeo/PDAL,radiantbluetechnologies/PDAL,mtCarto/PDAL,mtCarto/PDAL,lucadelu/PDAL,radiantbluetechnologies/PDAL,verma/PDAL,mtCarto/PDAL,mpgerlek/PDAL-old,verma/PDAL,boundlessgeo/PDAL,boundlessgeo/PDAL,verma/PDAL,jwomeara/PDAL,verma/PDAL,lucadelu/PDAL,lucadelu/PDAL,Sciumo/PDAL,DougFirErickson/PDAL,mtCarto/PDAL,lucadelu/PDAL,DougFirErickson/PDAL,Sciumo/PDAL,Sciumo/PDAL,boundlessgeo/PDAL,jwomeara/PDAL,mpgerlek/PDAL-old,verma/PDAL,radiantbluetechnologies/PDAL,DougFirErickson/PDAL,mpgerlek/PDAL-old,DougFirErickson/PDAL,mpgerlek/PDAL-old,Sciumo/PDAL,radiantbluetechnologies/PDAL