parameters are renamed, docs updated

README.md

docs/_source/customise.rst

docs/_source/get-started.rst

mlair/model_modules/model_class.py

mlair/run_modules/model_setup.py

test/test_data_handler/test_iterator.py

test/test_model_modules/test_advanced_paddings.py

test/test_model_modules/test_flatten_tail.py

test/test_model_modules/test_model_class.py

test/test_run_modules/test_model_setup.py