Set Georeference to "undetermined" when GDAL is unable to provide georeference information.
Set CoordinateSystem to "unknown" when GDAL is unable to provide coordinate system information.
Let GDAL probe if it can open a file with a non-ilwis extension that is not in the standard GDAL extensions list.
Merge branch 'master' of https://github.com/52North/IlwisConnectors.git