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/ml/test/test_gbttest.cpp

@@ -3,10 +3,6 @@
 
 #if 0
 
-#include <string>
-#include <fstream>
-#include <iostream>
-
 using namespace std;