This reverts commit 54ea5bba, reversing
changes made to 28e0d3d7.

The method ocl::oclMat::ptr() is being removed because it returns a pointer to a row of oclMat::data. The data attribute is a cl_mem structure and cannot be iterated outside an OpenCL kernel.

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

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

ReST directive was used. Also fixed some other ReST directives that were
not correct and removed some warnings during buildbot checks.

Add documentation.

fix a error in doc

Invalid links and refences fixed.
SpaeseMat class documentation updated.

All errors were found by doc/check_docs2.py