Add ocl version of boxFilter to the module img_proc
Fix issue in boxFilter with destination depth not equal to source depth.
Add check for depths of destination and source image. Fix warning C4127.
Another fix for disable "conditional expression is constant"
Change while(true) to for(;;) for fix compiler warning.
Fix problems with border extrapolation in kernel. Add Isolated/Nonisolated borders.
Merge pull request #1934 from vbystricky:ocl_boxFilter