#71 Multiple data list export to CSV

[ToniG]

Currently, only graph data line along with X values can be exported to CSV.
In the DataDisplay, with a data list of values , it would be very useful to export the list to CSV file (just like right click on the the graph line & export).
This has the advantage of exporting all listed data to a single CSV file.

In example attached, this would export 5 datasets to one file.

cheers