v0.2.0

• Generalized Coulomb repulsion parameter U. Now it can be either a float, or numpy.array. Therefore the on-site Coulomb repulsion does not need to be equal for all atoms. In extension it also allows multi-orbital Hamiltonians.
• Inclusion of inter-site Coulomb repulsion term (optional feature) through the parameter Uij.
• Reorganized plot classes in spectrum.py to have LDOS_from_eigenstate to plot the LDOS for a specific wavefunction and LDOS with a desired broadening distribution function, plus other minor changes in classes names.
• Modified write/read methods. Now the hash matching is optional and not set by default. Also now U can be written as a numpy.ndarray if this is the case
• Minor bug fixes, cleanups and improvements