don't interpolate your data!

I found a place to hide and write code this afternoon. I built the code to make fake data and do experiments in my new project with Andy Casey (Monash) which is about combining multi-epoch spectroscopy. The goal is to replace the shift-and-average things that most projects do with something that never interpolates or shifts the data; it only interpolates or shifts a data-driven model of the combined spectrum. I wrote a full set of code (it is only a few lines), and it works! Now to figure out if it is better than, or the same as, standard practices. I sure hope it's better!