Faster and less stable #2
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A wrong term was set, which led to slightly erroneous values. Thanks to this bug fix, the allowed error ratio is now significantly lower.
This bug is not spotted by the current validation suite, but it is still significant, as it makes convergence faster.
This leads to dramatic performance improvement without much accuracy loss.
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Same PR as
fast-and-stablebut without one of he commit, which results in slightly faster code, but less accurate with respect to the FORTRAN version.