implemented in-place estimation for simComputeH : 30% faster.
implemented in-place estimation for simComputeH : 30% faster.

SheffieldML/forkedGPmat,SheffieldML/forkedGPmat,SheffieldML/forkedGPmat,SheffieldML/forkedGPmat,SheffieldML/forkedGPmat,SheffieldML/forkedGPmat