Added make_point_list kernel
Added fill_accum kernel
Added getLines, fill_accum_local kernels
Added accuracy tests with real and generated data
Refactoring, minor optimization
Optimization for getLines
Refactoring and optimization
Added HoughLinesP OCL implementation
fix photo::cloning::IlluminationChange when IPP is used
change masking to patchNaNs
Exposing the FAST detector threshold for ORB

Implemented as a new optional parameter for
the constructor of the ORB detector. The
change of this parameter has been included
in the orb unit test.
change remaining c-api CV_ prefixes in constants
opencv_version
update gen_javadoc prints to python3 syntax fixed #3768
Optimization for HoughLinesP
small change in description for Gemm
Add code for print errors of OpenCL kernels runing
Merge pull request #3321 from vbystricky:oclShowRunErrors
Merge pull request #3320 from ElenaGvozdeva:gemm_doc
Merge pull request #3302 from berak:doc_fix_constants_30