MHKiT-Software / MHKiT-Python / 9881488285

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Improve `surface_elevation` internal method selection (#340)

* Test: Determine method using input frequency index

* Feat: Use sum of sines if ifft is not computable

This change allows `surface_elevation` to return a result if the user
inputs a spectrum with a frequency index that does not have a zero
frequency.

If the non zero frequency index condition is found when the method is
`ifft` we warn the user and change the method to `sum_of_sines`

* Fix: Use previously found frequency index

S.index may not exist for some input datasets, but f[0] does and we
should use the value of f[0] here.

* Test: Warn when using ifft with a non zero frequency

* Lint

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