Iterative refinement tolerance tuning #393
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This PR implements tuning for the iterative refinement. Previously, the tolerance was fixed to
1e-8, but this is impractical for single precisions. In this PR, we implement an adaptive tuning based on the overall tolerance of the solver. For double precision, we have the same behavior as before, but for single precision, this changes the behavior and makes things faster (less IR steps).It turns out that this PR makes the LiftedKKTSystem as it uses higher tolerance.