moved or added some imports for get_flat from reduce_dash to utils.py
commented out the use of unicorn.survey_paper as a dependency
removed creation of the jref directory in get_flat(), this is used only by ACS data and is not relevant here
added a shell script into the notebook folder to clean up the directory from intermediate product. This is convenient now for the test runs, maybe better incorporated (maybe in the main DashData class itself) at a later stage
This PR fixes some issues with utils.py: