support writing to specified output, make sure to actually build index
support writing to specified output, make sure to actually build index

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