BUG: implement cvfold setter, even if it is not exposed in the ML model...

BUG: implement cvfold setter, even if it is not exposed in the ML model because it is a pure virtual method in openCV

Modules/Learning/Supervised/include/otbCvRTreesWrapper.h

@@ -79,6 +79,8 @@ public:
   OTB_CV_WRAP_PROPERTY(int, MinSampleCount)
   OTB_CV_WRAP_PROPERTY(bool, UseSurrogates)
   
+  // warning: CV fold crash in openCV 3
+  OTB_CV_WRAP_PROPERTY(int, CVFolds)
   OTB_CV_WRAP_PROPERTY(bool, Use1SERule)
   OTB_CV_WRAP_PROPERTY(bool, TruncatePrunedTree)
   OTB_CV_WRAP_PROPERTY(float, RegressionAccuracy)

Modules/Learning/Supervised/src/otbCvRTreesWrapper.cxx

@@ -145,6 +145,7 @@ OTB_CV_WRAP_IMPL(int, MaxCategories)
 OTB_CV_WRAP_IMPL(int, MaxDepth)
 OTB_CV_WRAP_IMPL(int, MinSampleCount)
 OTB_CV_WRAP_IMPL(bool, UseSurrogates)
+OTB_CV_WRAP_IMPL(int, CVFolds)
 OTB_CV_WRAP_IMPL(bool, Use1SERule)
 OTB_CV_WRAP_IMPL(bool, TruncatePrunedTree)
 OTB_CV_WRAP_IMPL(float, RegressionAccuracy)