rce_workflow (schueltke): adapt folder names to pep8

...ADOworkflow/src/calibration/aux_interpolation_handling.py

...flow/src/calibration/check_calibration_value_deviation.py

...orkflow/src/calibration/check_calibration_value_target.py

...ADOworkflow/src/calibration/check_number_of_iterations.py

UNICADOworkflow/src/calibration/damp_iteration.py

UNICADOworkflow/src/calibration/extrapolation_failed.py

UNICADOworkflow/src/calibration/perform_mtom_calibration.py

UNICADOworkflow/src/calibration/perform_ome_calibration.py

UNICADOworkflow/src/calibration/perform_ome_iteration.py

...kflow/src/calibration/reset_free_calibration_variables.py

UNICADOworkflow/src/calibration/set_calibration_values.py

UNICADOworkflow/src/calibration/set_lever_arm.py

...ADOworkflow/src/calibration/set_new_calibration_factor.py

UNICADOworkflow/src/calibration/set_new_calibration_flag.py

...flow/src/calibration/set_settings_for_mtom_calibration.py

UNICADOworkflow/src/clean_up/clean_up_temporary_results.py

UNICADOworkflow/src/clean_up/post_operations_of_workflow.py

...sizing_loop/activate_plots_and_reports_for_sizing_loop.py

...rc/design_sizing_loop/estimate_design_sizing_residuals.py

...workflow/src/design_sizing_loop/initialize_calibration.py