fix #3296 : Unsupported gpu architecture 'compute_21'
refactored all the tests in ocl/test/test_imgproc.cpp
added ROI support to ocl::CLAHE
added ROI support to ocl::columnSum
added ROI support to ocl::convolve
fixed ocl::copyMakeBorder
rewrote ocl::remap
enabled double in copyMakeBorder kernel
refactored ocl matrix operations accuracy tests
ocl: workaround for msvc11 bug

"#error" requires DOS line endings (or fails with fatal error C1004: unexpected end-of-file found)
See: http://connect.microsoft.com/VisualStudio/feedback/details/794991/c-error-directive-and-unix-line-endings-leads-to-an-unexpected-end-of-file
So replace them to #pragma message.
made more demonstrative message about test fails
Change intrinsic camera matrix initialization

In the function cvInitIntrinsicParams2D the principal point for
normalized image coordinates is set to 0/0. This updates the function
to initialize the principal point at 0.5/0.5.
fix bug in gpu bgsegm sample

create `d_fgimg` matrix before cleaning.
misprint
added reflect, reflect101, replicate, wrap border types to ocl::remap
Merge pull request #1651 from ilya-lavrenov:misprint
missed initialization of kernel size
fixed ocl::Laplacian for case when scale != 1
Merge pull request #1633 from ilya-lavrenov:ocl_imgproc
Merge pull request #1644 from ilya-lavrenov:ocl_matrix_operations