workaround for cv::multiply bug
moved to relative errors in ocl::norm tests
fixed an accuracy test for ocl::resize (in some cases dsize.area() was equal to 0)
fixed ocl::copyMakeBorder
Merge pull request #1669 from ilya-lavrenov:ocl_copyMakeBorder
Merge pull request #1672 from ilya-lavrenov:ocl_arithm
Merge pull request #1673 from ilya-lavrenov:ocl_norm
Merge pull request #1676 from ilya-lavrenov:ocl_resize_test