Cudaarithm python bindings for merge and split are inconsistent with the format of existing cuda python functions.  Split does not return its output and merg's documentation is incorrect.

* ximgproc(test): createSuperpixelSLIC smoke test

* ximgproc: don't use 'operator+()' with empty cv::Mat

[moved from opencv] Merge pull request opencv/opencv#16150 from alalek:cmake_avoid_deprecated_link_private

* cmake: avoid deprecated LINK_PRIVATE/LINK_PUBLIC

see CMP0023 (CMake 2.8.12+)

* cmake: fix 3rdparty list

- don't include OpenCV modules

original commit: https://github.com/opencv/opencv/commit/a45928045a90493d45bd69244ea906d523900ba0

Add RIC method for sparse match interpolation

* * add RIC

* sparse_match_interpolators EdgeAwareInterpolation - enhance limitation of the maximal number of matches to be interpolated from SHORT_MAX to INT_MAX by substituting short by int types

* * add RIC citation

* * update EdgeAwareInterpolatorImpl

* * add intermediate RIC implementation

* * implementation of new paralelization classes. First test where sucessfull.

* * update documentation RICInterpolatorImpl and RLOF

* * update CMakeLists.txt remove highgui
* add test for RIC
* add ASSERTION for curr image

* * add cost map interface

* * fix internal cost map allocation bug

* * remove white spaces
* fix warnings

* *fix compiler warnings

* * remove double whitespaces
* underscore from parameters
* substitute parallel_for_() classes with lambda functions
* remove complex assertion statements
* remove dead code
* substitute swap function with std::swap()
* ocv_define_module now contains video instead of tracking module

* * remove whitespace endings

* * documentation update

* * remove double declarations that lead to warnings

* * unrole tracker.py
*  remove double space
* use static for inner functions
* update create function
* modify mem init. to avoid manual memory management

* * uncomment parallel_for_ for parallelization

* * unrole unwanted changes
* uncomment paralellization

* * remove empty comment
* change CHECK to CHK_GD
* remove not necessary ;

* *documentation remove double space

Patch cv::cudacodec::createVideoReader() memory leak until cudacodec can be updated to miirror NVidia example code.

backport commit 13f76375

backport commit 8c092493

Fix cudacodec::VideoReader::nextFrame python bindings

* Signla to python bindings generator that nextFrame's OutputArray is a GpuMat.
Also remove duplicate test in cudacodec

* cudacodec: drop CV_GPU, wrap GpuMat only

* Make it explicit that frame in nextFrame is GpuMat and cannot be multiple types as implied by OutputArray

VLA is part of C99, but still not part of C++ standard
Replace float variable-length-arrays with unique_ptr arrays (which are
part of C++14)

not needed since we require OGRE 1.11.5 via CMake

Added constructors and destructors for RgbdPlane

* declared constructors and destructors of RgbdPlane

* definitions written

* tests for python bindings added