OSSIM: update to svn 15872 of ossim and ossim_plugins

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

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

...ities/otbossim/include/ossim/imaging/ossimIgenGenerator.h

Utilities/otbossim/include/ossim/imaging/ossimImageData.h

Utilities/otbossim/include/ossim/imaging/ossimImageHandler.h

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

...ossim/include/ossim/imaging/ossimOverviewBuilderFactory.h

...m/include/ossim/imaging/ossimOverviewBuilderFactoryBase.h

...clude/ossim/imaging/ossimOverviewBuilderFactoryRegistry.h

...s/otbossim/include/ossim/imaging/ossimOverviewSequencer.h

...otbossim/include/ossim/imaging/ossimTiffOverviewBuilder.h

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

Utilities/otbossim/include/ossim/imaging/ossimTileCache.h

...otbossim/include/ossim/imaging/ossimVirtualImageHandler.h

...ossim/include/ossim/imaging/ossimVirtualImageTiffWriter.h

.../otbossim/include/ossim/imaging/ossimVirtualImageWriter.h

...ossim/include/ossim/imaging/ossimVirtualOverviewBuilder.h

...sim/include/ossim/imaging/ossimVpfAnnotationFeatureInfo.h

Utilities/otbossim/include/ossim/parallel/ossimOrthoIgen.h

Utilities/otbossim/include/ossim/support_data/ossimGeoTiff.h