Smooth out local score arrays prior to them being passed into Isolate algorithm

[JacobGlennAyers]

Add a new parameter to the Isolate() and calc_local_scores() function that allows a user to try out different techniques that involve smoothing out the local score arrays. This can come in the form of techniques such as polynomial fitting or the curve smoothing technique on the curveSmoothing branch of the passive-acoustic-biodiversity repo.

This gives us a larger space of modulations to the isolate function to test for improved performance.