ENH: Allow `Splinterpolator` instances to be created from an existing set of spline coefficients, and extend extrapolation options
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Splinterpolator class can now accept a pointer to an array of pre-calculated coefficients - in this case, a copy of the pointer is used (the data is not copied), and pre-filtering (coefficient calculation) is skippedSoftZeros extrapolation method - out of bounds coefficients will be set to zero, but out-of-bounds coordinates will still be constructed via interpolation. This differs from the existing Zeros extrapolation method, where out-of-bounds coordinates are forced to zero.Constant extrapolation is requested; previously, a mirroring boundary condition was used.Splinterpolator::Copy function, which allows the spline coefficients to be copied/extracted.