make Stage a friend of StageBase so they can interact with StageBase private data members
make Stage a friend of StageBase so they can interact with StageBase private data members

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