Merge branch 'normalized_amplitudes_pp' into normalized_amplitudes_DomT

demos/find_amplitude_parameters.py

demos/getting_started_3.py

demos/getting_started_mf.py

demos/multi_amplitudes_consistency.py

demos/newamplitudes.py

docs/source/volume.rst

nifty5/__init__.py

nifty5/data_objects/distributed_do.py

nifty5/data_objects/numpy_do.py

nifty5/domain_tuple.py

nifty5/domains/log_rg_space.py

nifty5/extra.py

nifty5/field.py

nifty5/library/correlated_fields.py

nifty5/library/light_cone_operator.py

nifty5/linearization.py

nifty5/minimization/metric_gaussian_kl_mpi.py

nifty5/operators/energy_operators.py

nifty5/operators/exp_transform.py

nifty5/operators/log1p.py