starting on melody eval code, currently just resample sequences and match lengths
completed all 5 metrics, not handling negative frequencies yet
interpolate in cent scale, handle negative values, and added description
change approach: interpolate abs values, fix zero transitions, then restore sign to interpolated signal (tanglier, but more correct I think)
added a safety stop in while loops
added a nice plotting option
fix tiny bug in time_grids and made plots even prettier
added some safety check at the very beginning
improved description
cleaned while loops in steps 5 and 6
added legends
removed plotting code and all debug comments