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

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

- Used lunix style slashes - works on most systems
- Removed all trailing whitespaces

bug #2709

extended morphological operations to handle arbitrary number of channels and CV_64F type; extended filter2D to handle CV_16S type. added test to check the supported formats; added description of supported formats in various filtering operations.

extended Sobel & Scharr description (ticket #1555). Added CV_32F/CV_64F format combination in sepFilter2D.

* Fixed display of struct and class definitions (except classes with base class specified).
* Fixed formatting and referencing errors in several documentation files.

fixed and improving formatting in opencv2refman.pdf. added support for n-channel mask in Mat::copyTo() and n-channel images in cv::compare(). fixed 2 compile warnings in opencv_python.

* Added manual port for getTextSize;
* Fixed bugs in "native camera" sample;
* Added 15-puzzle sample.