Feature: background subtraction

It is possible that we have a Molecular Dynamics (MD) simulation, where we have a system of interest in a solution or environment or surrounding and we want to know the scattering from the system of interest only.

There are two possibilities to subtract the unwanted scattering from the surrounding:

1. subtract in real space: This gives us the correct result in small angle region but not in wide angle region
2. subtract in reciprocal space: This gives us the correct result in the small and wide angle region.

Feature: Adds a possibility to subtract the scattering from the surrounding in the reciprocal space