replace GDAL-based NITF reader with a Nitro-based one
replace GDAL-based NITF reader with a Nitro-based one
missed a GDAL->NITRO ifdef
NITF test now depends on WITH_NITRO, not WITH_GDAL #477
Merge pull request #477 from PDAL/nitro-reader3

PR to add mpg's drivers.nitf.reader rework