remove redundant OPENCL_DIR flag

remove as much warnings as possible
use enum instead of MACRO for ocl.hpp
add command line parser in accuracy test and perf test
some bug fix for arthim functions

modules/ocl/perf/perf_surf.cpp

@@ -54,11 +54,11 @@ using namespace cvtest;
 using namespace testing;
 using namespace std;
 
-#define FILTER_IMAGE "../../../samples/gpu/road.png"
+extern std::string workdir;
 
 TEST(SURF, Performance)
 {
-    cv::Mat img = readImage(FILTER_IMAGE, cv::IMREAD_GRAYSCALE);
+    cv::Mat img = readImage(workdir+"lena.jpg", cv::IMREAD_GRAYSCALE);
     ASSERT_FALSE(img.empty());
 
     ocl::SURF_OCL d_surf;