Draft: Resolve "Metadata refactoring - Update gdal metadata "
- ImageFileWriter : export OTB metadata during writing
- ImageFileReader : import OTB metadata during reading
- Update otbGDALImageIOImportExportMetadata in order to check import/export metadata
- Some drivers don't support metadata writing (jp2 for example). In order to solve this problem and to write the metadata in a OTB domain we propose to export a metadata xml file.