removed slamch.c/dlamch.c -specific GCC options, since the current implementation is very simple and relies on IEEE754 standard, rather than the actual machine behavior.

added flags OpenCV_COMPUTE_CAPABILITIES, which stores the version compute capability from which it is compiled opencv
now use opencv with cuda in your application  in the such way : set(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS} ${OpenCV_COMPUTE_CAPABILITIES})

renamed colorizeDisp to drawColorDisp, added acync version of drawColorDisp and reprojectImageTo3D_GPU.

Forgot to update so code after previous fix

added comments in gpu.hpp

This was crashing my code:
    for( size_t i = 1; i < imagePoints.size(); i++ )
        objectPoints.push_back(objectPoints[0]);

Changed by:
objectPoints.resize(imagePoints.size(),objectPoints[0]);

Plus clean up on Qt code

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