fix up block edge accounting
fix up block edge accounting

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