PR #2968: cce2d992 8578f9c5
Fixed bug which caused crash of GPU version of feature matcher in stitcher

The bug caused crash of GPU version of feature matcher in stitcher when
we use ORB features.

PR #3236: 5947519f
Check sure that we're not already below required leaf false alarm rate before continuing to get negative samples.

PR #3190
fix blobdetector

PR #3562 (part): 82bd82e2
TBB updated to 4.3u2. Fix for aarch64 support.

PR #3604 (part): 091c7a38
OpenGL interop sample reworked not ot use cvconfig.h

PR #3792: afdf319f
Add -L for CUDA libs path to pkg-config

Add all dirs from CUDA_LIBS_PATH as -L linker options to
OPENCV_LINKER_LIBS. These will end up in opencv.pc.

PR #3893: 122b9f8e
Turn ocv_convert_to_lib_name into a function

PR #5490: ec5244a7
fixed memory leak in findHomography tests

PR #5491: 0d5b739d
delete video readers

PR #5574

PR #5202

connectedComponents and connectedComponentsWithStats in
imgproc accept 8-bit single channel image only for input.

See https://github.com/Itseez/opencv/issues/5721

COMMENTS:
* The second __syncthreads() is necessary, I am sure of that.
* The code works without the first __syncthreads() too, but I have however added it for symmetry. Anyway it doesn't affect time performances, I have checked it with some profiling with nvvp

In oder to guarantee SIMDness between the two compilation steps we choose the
highest SIMD size that is optimized in the kernel for the first step.

wsfixed