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/stitching/perf/perf_estimators.cpp

@@ -2,11 +2,9 @@
 #include "opencv2/imgcodecs.hpp"
 #include "opencv2/opencv_modules.hpp"
 
-using namespace std;
-using namespace cv;
+namespace opencv_test
+{
 using namespace perf;
-using std::tr1::tuple;
-using std::tr1::get;
 
 typedef TestBaseWithParam<tuple<string, string> > bundleAdjuster;
 
@@ -98,3 +96,5 @@ PERF_TEST_P(bundleAdjuster, affine, testing::Combine(TEST_DETECTORS, AFFINE_FUNC
     EXPECT_FLOAT_EQ(h.at<float>(1), 0.f);
     EXPECT_FLOAT_EQ(h.at<float>(2), 1.f);
 }
+
+} // namespace