return a const& instead of a copy of the pdal::Schema for Reader::getSchema
return a const& instead of a copy of the pdal::Schema for Reader::getSchema

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