more renamings

demos/Wiener_Filter.ipynb

demos/bernoulli_demo.py

demos/find_amplitude_parameters.py

demos/getting_started_1.py

demos/getting_started_2.py

demos/polynomial_fit.py

nifty6/domains/lm_space.py

nifty6/domains/power_space.py

nifty6/domains/rg_space.py

nifty6/field.py

nifty6/library/correlated_fields.py

nifty6/library/los_response.py

nifty6/linearization.py

nifty6/minimization/metric_gaussian_kl_mpi.py

nifty6/minimization/scipy_minimizer.py

nifty6/multi_field.py

nifty6/operator_spectrum.py

nifty6/operators/distributors.py

nifty6/plot.py

nifty6/probing.py