BUG: remove unused namespace definition

Examples/Learning/SVMImageClassificationExample.cxx

@@ -58,8 +58,6 @@
 int main(int argc, char* argv[])
 {
 
-  namespace stat = itk::Statistics;
-
   if (argc != 4)
     {
     std::cout << "Usage : " << argv[0] << " inputImage outputImage modelFile "

Testing/Code/Learning/otbSVMClassifierImage.cxx

@@ -59,8 +59,6 @@ public:
 
 int otbSVMClassifierImage(int argc, char* argv[])
 {
-  namespace stat = itk::Statistics;
-
   if (argc != 4)
     {
     std::cout << "Usage : " << argv[0] << " inputImage modelFile outputImage"

Testing/Code/Learning/otbSVMClassifierPointSet.cxx

@@ -32,8 +32,6 @@
 
 int otbSVMClassifierPointSet(int argc, char* argv[])
 {
-  namespace stat = itk::Statistics;
-
   if (argc != 2)
     {
     std::cout << "Usage : " << argv[0] << " modelFile"