Our prebuilt FFmpeg Windows binaries don't have PNG support enabled
(because that requires zlib), so that makes a PNG image a bad choice
for this test.

When FFmpeg doesn't support PNG, VideoCapture falls back to the
"image sequence" implementation, which doesn't work for single images.

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'

Also, I made a separate macro for the current function name, which
helps simplify a lot of code that uses it.

Cleaned up adaptive bilateral filtering, added support for gaussian interpolation, updated sample and docs

This reverts commit d63a38e9.

Conflicts:
	modules/ocl/test/test_ml.cpp