Correct Neutrons Routine

As discussed we need to build a routine for correcting neutrons. This should be stand alone so that somebody could use it in a pipeline of their own.

We will have:

1. Stand alone functions based on the key equations (mostly done)
2. A system to compile together functions into a processing system
3. A system to apply the functions on a dataframe
4. A way to apply all this in CRNSDataHub

I will sketch out the design based on this, and then we can add the details later.