Classes

2 Classes added:
- SingleParticle Class for particles without repulsion (up to 2
electrons)
- ManyBody Class for interacting particles

might be a bit dirty.
Classes

2 Classes:
- SingleParticle Class
- ManyBody Class  with perturbed and unperturbed wave functions

Is single particle class wave function properly computed?
Single Particle Normalization

Omega and the quantum number nx are now global
Normalization of wave function for single particles
merge-conflicts