clean up a few truncation warnings
clean up a few truncation warnings

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