Revert "use GDAL's NITFGetField instead of our own"
Revert "use GDAL's NITFGetField instead of our own"

This reverts commit 69b97e682b2d6d3e8ee752dc28b9146c29a15fcf.

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