Fixed KinFu getCloud() at empty volume

* KinFu getCloud(): an empty volume check added to OCL code

* minor

Update test_hdr.cpp

Update test_hdr.cpp

Remove not used dependency.
Fix some warnings reported by VS2017.

* cuda_mog2_issue_5296
original commit: https://github.com/opencv/opencv/commit/5bf73457431b7d2cb87ac8c107865388dbf66642

Add LOGOS (Local geometric support for high-outlier spatial verification) features matching strategy.

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.

Harmonise bibtex formatting. Sort entries alphabetically by the last name of the first paper author.

* 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