IPP can be switched on and off on runtime;

Optional implementation collector was added (switched off by default in CMake). Gathers data of implementation used in functions and report this info through performance TS;

TS modifications for implementations control;

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 move cv::linemod to own header

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

Declare vars as locally as possible

disabled the use of SSE4 instructions as well to make the code compatible with the old Intel and AMD chips

added test for the old cvHaarDetectObjects. disabled AVX optimization in haar.cpp. it should cover tickets #2534, #2591, #2669

#523 Fix the problem where the MaxSize parameter in cvHaarDetectObjects does not work when the flag CV_HAAR_SCALE_IMAGE is not set.

probably fixed parallel face detector (i.e. built with TBB), ticket #1185. Thanks to mengw for the patch