Merge branch 'sampling_extraction' into develop

Modules/Applications/AppClassification/app/CMakeLists.txt

...pplications/AppClassification/app/otbSampleExtraction.cxx

Modules/Applications/AppClassification/test/CMakeLists.txt

...Learning/Sampling/include/otbImageSampleExtractorFilter.h

...arning/Sampling/include/otbImageSampleExtractorFilter.txx

...ing/Sampling/include/otbOGRDataToSamplePositionFilter.txx

...arning/Sampling/include/otbPersistentSamplingFilterBase.h

...ning/Sampling/include/otbPersistentSamplingFilterBase.txx

Modules/Learning/Sampling/otb-module.cmake

Modules/Learning/Sampling/test/CMakeLists.txt

...rning/Sampling/test/otbImageSampleExtractorFilterTest.cxx

Modules/Learning/Sampling/test/otbSamplingTestDriver.cxx

...on/Conversion/include/otbPersistentImageToOGRDataFilter.h

.../Conversion/include/otbPersistentImageToOGRDataFilter.txx