Removed due to uninteresting potential.
Added script simulating delta potential.
Added ForwardEuler counterpart scripts to CN.

Didn't remember that Forward Euler does not keep normalization. Have
added this now. The simulations take more computing power and dt has to
be much lower but they give the same results as CrankNicolson.
Removed unnecessary code.
Corrected incorrect title in plot.
Added some comments.
Added correct docstring to potential function.
Corrected title of plot.
Added comment about normalization. Fixed title of plot.
Added comment about normalization. Fixed docstring in V function. Fixed title of plot.
Added comment about normalization.
Added comment about normalization. Fixed title of plot.