OSSIM: update ossim to r16861 (v1.8.1)

Utilities/otbossim/CMakeLists.txt

Utilities/otbossim/include/ossim/base/ossimFilename.h

Utilities/otbossim/include/ossim/base/ossimNotify.h

Utilities/otbossim/include/ossim/base/ossimXmlDocument.h

...otbossim/include/ossim/elevation/ossimElevationDatabase.h

...ties/otbossim/include/ossim/imaging/ossimJpegTileSource.h

...es/otbossim/include/ossim/imaging/ossimSingleImageChain.h

Utilities/otbossim/include/ossim/init/ossimInit.h

...ities/otbossim/include/ossim/support_data/ossimInfoBase.h

Utilities/otbossim/src/ossim/base/ossimFilename.cpp

Utilities/otbossim/src/ossim/base/ossimNotify.cpp

Utilities/otbossim/src/ossim/base/ossimXmlNode.cpp

...bossim/src/ossim/elevation/ossimDtedElevationDatabase.cpp

Utilities/otbossim/src/ossim/elevation/ossimDtedHandler.cpp

...s/otbossim/src/ossim/elevation/ossimElevationDatabase.cpp

...c/ossim/elevation/ossimGeneralRasterElevationDatabase.cpp

...bossim/src/ossim/elevation/ossimSrtmElevationDatabase.cpp

Utilities/otbossim/src/ossim/elevation/ossimSrtmHandler.cpp

Utilities/otbossim/src/ossim/imaging/ossimImageChain.cpp

Utilities/otbossim/src/ossim/imaging/ossimJpegTileSource.cpp