extending openCL info dump
speeded up ocl::distanceToCenters
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 #1763 from SpecLad:cv-func
Merge pull request #1755 from KonstantinMatskevich:dump_info
Merge pull request #1759 from ilya-lavrenov:ocl_distanceToCenters
CMake's get_filename_component with NAME_WE parameters, interprets first period as start of extension. For. e.g file name with out extension of 'this.is.a.text.file.txt' will be taken as 'this'. Hence using NAME with regex replacement to get 'this.is.a.text.file'
Merge pull request #1771 from kiranpradeep:2.4