make libLAS 1.6.0 a required dependency for now
make libLAS 1.6.0 a required dependency for now

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