v1.1 - various changes to data and metadata, described below
 - added further data points to data file (those sampled from trace metal rosette)
 - added ACE station number and ACE event number to data file
 - reordered columns in data file
 - updated README with information about sampling of trace metal rosette
 - updated README with new citation, license, dataset contact and dataset contents, updated abstract
 - updated data_file_header with new data fields
 - added comparison plot of CTD and TMR data points
 - updated caption of plot of nutrient concentrations along track (only from CTD samples)

v1.0 - initial release of dataset