Set frequency resolution of adaptive sweeps via Qs of PROM-computed eigenvalues

[parrangoiz]

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#121 is very nice, thanks @sebastiangrimberg. With more reliable eigenvalue estimates computed from the PROM, one idea would be to use their Qs to set the frequency resolution of the (linear) array of returned samples, probably via a user-controlled config parameter that sets how many points you want within one linewidth of your highest-Q resonance within the band of interest. Seemed like you were open to this idea so I'm adding it here to track it.

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