dataObject.rand returns INT_MIN value for datatype int32

The code

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a = dataObject.rand([10,10], 'int32')

returns the value INT_MIN (-2**31) for all values instead of a uniform distribution in the range [-2**31, 2**31-1), which is the desired case.

The problem is the underlying implementation of cv::randu which is responsible for this.

A solution will be to limit the value range for the underlying call of cv::randu to [-2**30, 2**30-1) and then make a 2nd loop over all values and calculate:

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value = (value << 1) + cv::RNG::uniform(0,2);

This will multipliy the original value by 2 (bitshift) and add a uniformly distributed value 0 or 1.

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