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

also refactored VideoSource interface (made it simplier, now it has only 2 abstract methods)

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

Made all STL usages explicit to be able automatically find all usages of
particular class or function.

added downsample function into gpu module, refactored it a little bit, added guard for CUDA related include in cascadeclassifier_nvidia_api.cpp

deleted NPP_VERSION and NPP_HAVE_COMPLEX_TYPE macros, because last NPP supports complex types under linux

warnings in cxcore
added graphcut wrapper

--no commit message

Simple implementation of StereoBM_GPU.
It is excluded from compilation now.