- fixed one BiB record
- moved algorithms overview to separate page
- added docs for some enumerations
- fixed some small documentation errors

- Reworked documentation to reflect actual code
- Removed some unused variables
- Removed unnecessary 'cv::' modifiers

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

Added new kernels to documentation

Copied the docstring description

Invalid links and refences fixed.
SpaeseMat class documentation updated.

This reverts commit 4d36be87.

Conflicts:
	modules/ml/include/opencv2/ml/ml.hpp
	modules/ml/src/data.cpp