Fix SPSA for 1 < c < 2 and set c to the real delta #1929
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This PR fixes the issue of it being possible for there to be no delta when c is between 1 and 2.
It also sets c to the real delta (after stochastic rounding is applied) so we dont get a wrong update.
It also fixes stochastic rounding and clipping. Previously if we had a maximum of 128.5 for example, it was possible for a value of 129 to be ran. Now, we ensure the integer maximums are never exceeded