OSSIM: update ossim to r20606

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

Utilities/otbossim/include/ossim/kbool/graph.h

Utilities/otbossim/include/ossim/kbool/graphlst.h

Utilities/otbossim/include/ossim/kbool/lpoint.h

Utilities/otbossim/include/ossim/ossimVersion.h

...s/otbossim/include/ossim/projection/ossimIkonosRpcModel.h

...tbossim/include/ossim/projection/ossimQuickbirdRpcModel.h

Utilities/otbossim/src/ossim/CMakeLists.txt

...ssim/src/ossim/base/ossimAdjustableParameterInterface.cpp

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

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

Utilities/otbossim/src/ossim/base/ossimDatumFactory.inc

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

...s/otbossim/src/ossim/base/ossimMultiResLevelHistogram.cpp

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

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

...ies/otbossim/src/ossim/imaging/ossimNitfTileSource_12.cpp

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

Utilities/otbossim/src/ossim/parallel/ossimOrthoIgen.cpp

...s/otbossim/src/ossim/plugin/ossimSharedPluginRegistry.cpp