Merge branch 'develop' into 'release_v0.12.1'

Examples_from_manuscript.ipynb

README.md

docs/_source/customise.rst

docs/_source/get-started.rst

mlair/model_modules/model_class.py

mlair/run_modules/model_setup.py

mlair/run_modules/post_processing.py

mlair/run_modules/run_environment.py

mlair/workflows/abstract_workflow.py

test/test_data_handler/test_iterator.py

test/test_model_modules/test_model_class.py

test/test_run_modules/test_model_setup.py