fixed ocl::minMax
fixed ocl::countNonZero
fixed ocl::sum, ocl::sqrSum, ocl::absSum
fixed ocl::phase
fixed ocl::setIdentity
fixed ocl::meanStddev and created accuracy test for this function
fixed and extended ocl::norm
removed test_norm.cpp from ocl tests
Merge pull request #1519 from ilya-lavrenov:ocl_minMax