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

Fix image to be used by perf test.

fixed extrapolation for ocl::cornerMinEigenVal and ocl::cornerHarris; enabled CV_32FC1 for the first function

It supports NORM_L1 distance types now and can
use user provided indices.
Also fixed a bug of kmeans where distance pointers should be float instead
 of double.

NORM_L2 changed to NORM_L2SQR, Accuracy and Perf tests are added

added ROI support in accuracy test of distanceToCenters