extending openCL info dump
speeded up ocl::distanceToCenters
added CV_16SC2 && CV_16UC1 maps support to ocl::remap (nearest neighbour only)
update
Enabled CV_Assert and such to print the function name with Visual C++.

Also, I made a separate macro for the current function name, which
helps simplify a lot of code that uses it.
Merge pull request #1760 from ilya-lavrenov:ocl_remap_nn
Merge pull request #1763 from SpecLad:cv-func
Merge pull request #1755 from KonstantinMatskevich:dump_info
Merge pull request #1759 from ilya-lavrenov:ocl_distanceToCenters