BUG: rate files are csv

Modules/Applications/AppClassification/app/otbTrainImagesRegression.cxx

@@ -95,7 +95,7 @@ protected:
     
     samplingRateAppli->SetParameterStringList( "il", m_FileHandler[ "statsFiles" ]);
     
-    std::string outputFileName = "rates.xml";
+    std::string outputFileName = "rates.csv";
     samplingRateAppli->SetParameterString("out", outputFileName);
     
     if (HasValue("sample.nt"))
@@ -115,7 +115,7 @@ protected:
     auto& rateFiles = m_FileHandler["rateFiles"];
     for (unsigned int i = 0; i< m_FileHandler["statsFiles"].size(); i++)
     {
-      rateFiles.push_back("rates_"+std::to_string(i+1)+".xml");
+      rateFiles.push_back("rates_"+std::to_string(i+1)+".csv");
     }
     
   }