ENH : add IKONOS metadata supprot

Code/IO/otbImageFileReader.txx

Code/IO/otbImageMetadataInterface.cxx

Code/IO/otbImageMetadataInterface.h

Testing/Code/IO/CMakeLists.txt

Testing/Code/IO/otbIOTests17.cxx

...otbossim/include/ossim/support_data/ossimIkonosMetaData.h

...ies/otbossim/src/ossim/projection/ossimIkonosRpcModel.cpp

...s/otbossim/src/ossim/support_data/ossimIkonosMetaData.cpp