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/features2d/test/test_matchers_algorithmic.cpp

@@ -41,8 +41,7 @@
 
 #include "test_precomp.hpp"
 
-using namespace std;
-using namespace cv;
+namespace opencv_test { namespace {
 
 const string FEATURES2D_DIR = "features2d";
 const string IMAGE_FILENAME = "tsukuba.png";
@@ -65,7 +64,9 @@ protected:
     virtual void run( int );
     void generateData( Mat& query, Mat& train );
 
-    void emptyDataTest();
+#if 0
+    void emptyDataTest(); // FIXIT not used
+#endif
     void matchTest( const Mat& query, const Mat& train );
     void knnMatchTest( const Mat& query, const Mat& train );
     void radiusMatchTest( const Mat& query, const Mat& train );
@@ -77,6 +78,7 @@ private:
     CV_DescriptorMatcherTest& operator=(const CV_DescriptorMatcherTest&) { return *this; }
 };
 
+#if 0
 void CV_DescriptorMatcherTest::emptyDataTest()
 {
     assert( !dmatcher.empty() );
@@ -156,6 +158,7 @@ void CV_DescriptorMatcherTest::emptyDataTest()
     }
 
 }
+#endif
 
 void CV_DescriptorMatcherTest::generateData( Mat& query, Mat& train )
 {
@@ -554,3 +557,5 @@ TEST( Features2d_DMatch, read_write )
     String str = fs.releaseAndGetString();
     ASSERT_NE( strstr(str.c_str(), "4.5"), (char*)0 );
 }
+
+}} // namespace