ADRG: robustness fixes and code simplification; fix ADRG dataset creation that had invalid width for LSO/PSO/SWO/etc... subfields; fix sample dataset

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@25843 f0d54148-0727-0410-94bb-9a71ac55c965
SRP: robustness fixes

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@25844 f0d54148-0727-0410-94bb-9a71ac55c965