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

* OpenCV4Tegra/ is no longer relevant.
* We should only ignore the particular refman.rst that we generate.