Signed-off-by: Maxim Kostin <v-maxkos@microsoft.com>

if points0 is empty checkVector(2) return -1, it causes the exception

if they are not needed

OpenCV with the refactored features2d compiles! contrib is broken for now; the tests are not tried yet

OpenCV with the refactored features2d compiles! contrib is broken for now; the tests are not tried yet

An extremely rare case where, for numeric reasons bestM finds more inliers than ninliersMax. 
This RARE case causes memory corruption and a nasty seg fault.

Conflicts:
	modules/core/include/opencv2/core/cuda.hpp
	modules/cudacodec/src/thread.cpp
	modules/cudacodec/src/thread.hpp
	modules/superres/perf/perf_superres.cpp
	modules/superres/src/btv_l1_cuda.cpp
	modules/superres/src/optical_flow.cpp
	modules/videostab/src/global_motion.cpp
	modules/videostab/src/inpainting.cpp
	samples/cpp/stitching_detailed.cpp
	samples/cpp/videostab.cpp
	samples/gpu/stereo_multi.cpp

Looks like we don't actually use them; when creating precompiled headers
with Visual C++, a dummy .cpp is created at build time.

Changed visibility of the virtual functions in OnePassStabilizer and TwoPassStabilizer that are derived from StabilizerBase from private to protected to enable stabilizer implementations that are derived from OnePassStabilizer and TwoPassStabilier to properly overwrite these functions

This reverts commit fba72cb6, reversing
changes made to 02131ffb.