Add various radarsat-1 related metadata fields (#4996)

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@25657 f0d54148-0727-0410-94bb-9a71ac55c965
added various metadata fields (#4997)

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@25658 f0d54148-0727-0410-94bb-9a71ac55c965