add simple QM systems + sympy code to work with them

[Ondřej Čertík]

In particular:

1. hydrogen atom + energies, also exact energy from Dirac equation

2. all the other stuff, see the sympy list

[Ondřej Čertík]

Plus derivation. Here is some source:

http://www.docstoc.com/docs/20849690/Dirac-Equation-and-Hydrogen-Atom