CH_migration_data       CH_migration_data
add_flowmap             Add a flow map to a ggplot
cantons                 cantons
get_circle_coords       Helper function to create coordinates for
                        circles of nodes
hca_flowdat             Use hierarchical clustering to merge nodes
                        based on proximity
short_scale             Create short scale format for numbers in the
                        legend
util_data_flow_to_flowdat
                        util_data_flow_to_flowdat
