JPEG2000 drivers: take into account PixelIsPoint in GeoJP2 boxes to do the translation from GeoTIFF model to GDAL model (unless GTIFF_POINT_GEO_IGNORE is set to YES), consistently with GTiff driver, and expose AREA_OR_POINT=Point (based on patch by degrootc, #5437)

git-svn-id: https://svn.osgeo.org/gdal/trunk@27181 f0d54148-0727-0410-94bb-9a71ac55c965