Log Message:
Import harminv-1.3.1 as wip/harminv.

Harminv is a free program (and accompanying library) to solve the problem of
harmonic inversion given a discrete-time, finite-length signal
that consists of a sum of finitely-many sinusoids (possibly exponentially
decaying) in a given bandwidth, it determines the frequencies, decay
constants, amplitudes, and phases of those sinusoids.