Merge branch 'add-pre-commits-slowly' into 'master'

test/likelihood_test.py

test/make_standard_data.py

test/noise_realisation_test.py

test/other_test.py

test/prior_test.py

test/proposal_test.py

test/result_test.py

test/sample_from_the_prior_test.py

test/sampler_test.py

test/series_test.py

test/utils_py3_test.py

test/utils_test.py

test/waveform_generator_test.py