WRG: remove warning with gcc4.6 unused variables.

Code/Common/otbDrawLineSpatialObjectListFilter.txx

Code/FeatureExtraction/otbAddCarvingPathFilter.txx

Code/FeatureExtraction/otbParallelLinePathListFilter.txx

Code/FeatureExtraction/otbRemoveCarvingPathFilter.txx

Code/IO/otbGDALImageIO.cxx

Code/IO/otbOGRVectorDataIO.cxx

Code/Radiometry/otbLuminanceToReflectanceImageFilter.h

Code/Simulation/otbSailModel.cxx

Examples/FeatureExtraction/SURFExample.cxx