Mod: Open header files with `io.open` for Python 2/3 compatibility.
Fix Cuda -Wl linker options

This line causes the following error when building custom projects that use OpenCV beta 3:
ld: warning: directory not found for option '-L/<project_root>/-Wl,/usr/local/cuda'
Merge pull request #3410 from mgharbi:master
Fix canny segment fault (Bug #3978)

Avoid stack overflow based on std::vector cause
std::vector::resize() segmentation fault.
Merge pull request #3407 from wangyan42164:canny_bug_fix
Doxygen documentation for core module
Merge pull request #3406 from shiquanwang:Fix-bug-#4003_build-python-binding-under-python3
Improve the performance of fast_nlmeans_denoising_opencl.

1. Remove unnecessary barriers.
2. Adjust CTA_SIZE based on the following cases for Intel platform:
   a) OCL_Photo_DenoisingGrayscale.DenoisingGrayscale
   b) OCL_Photo_DenoisingColored.DenoisingColored
fix gpu performance sample compilation
Merge pull request #3413 from wangyan42164:denoising_opencl_improvement
Merge pull request #3415 from jet47:fix-gpu-perf-sample
Merge pull request #3399 from mshabunin:doxygen-core