ts: refactor OpenCV tests

- removed tr1 usage (dropped in C++17)
- moved includes of vector/map/iostream/limits into ts.hpp
- require opencv_test + anonymous namespace (added compile check)
- fixed norm() usage (must be from cvtest::norm for checks) and other conflict functions
- added missing license headers

modules/core/test/test_conjugate_gradient.cpp

@@ -39,7 +39,8 @@
 //
 //M*/
 #include "test_precomp.hpp"
-#include <cstdlib>
+
+namespace opencv_test { namespace {
 
 static void mytest(cv::Ptr<cv::ConjGradSolver> solver,cv::Ptr<cv::MinProblemSolver::Function> ptr_F,cv::Mat& x,
         cv::Mat& etalon_x,double etalon_res){
@@ -103,3 +104,5 @@ TEST(Core_ConjGradSolver, regression_basic){
     }
 #endif
 }
+
+}} // namespace