move Operator

nifty5/__init__.py

nifty5/energies/hamiltonian.py

nifty5/energies/kl.py

nifty5/library/amplitude_model.py

nifty5/library/bernoulli_energy.py

nifty5/library/correlated_fields.py

nifty5/library/gaussian_energy.py

nifty5/library/poissonian_energy.py

nifty5/operator.py

nifty5/operators/linear_operator.py

nifty5/operators/operator.py