Add set_offset so that curandSetGeneratorOffset() can be called. #185
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Setting the seed with curandSetPseudoRandomGeneratorSeed() initializes the state of the PRNG but does not restart the sequence.
Per the docs curandSetGeneratorOffset() can be used to skip ahead in the random sequence such that "multiple runs of the same program to continue generating results from the same sequence without overlap". It may also be desirable to reset the offset back to zero (or another index) to reproduce a prior result.
The change simply adds set_offset to expose access to curandSetGeneratorOffset().