renamings

demos/nonlinear_critical_filter.py

demos/wiener_filter_via_hamiltonian.py

docs/source/concepts/operators.rst

nifty4/library/critical_power_energy.py

nifty4/library/noise_energy.py

nifty4/library/nonlinear_power_energy.py

nifty4/library/response_operators.py

nifty4/operators/__init__.py

nifty4/operators/dof_distributor.py

nifty4/operators/power_distributor.py

nifty4/sugar.py

test/test_energies/test_map.py

test/test_energies/test_noise.py

test/test_energies/test_power.py

test/test_operators/test_adjoint.py