renamed function arrange_plots_on_A4 to arrange_plots_on_one_canvas and changed its functionality
renamed function arrange_plots_on_A4 to arrange_plots_on_one_canvas and changed its functionality

markusrademacher/datahandling,markusrademacher/datahandling,AshleySetter/optoanalysis,AshleySetter/datahandling,AshleySetter/optoanalysis,AshleySetter/datahandling