Add column taxon type on downloads

[CrisSevilleja]

Several users have told me that they would like us to include a taxon type column to distinguish moths from butterflies, especially for transects and 15 minute downloads.

I think it would be useful for users to analyse the data and also for surveys where multiple taxa are involved.
@DavidRoy do you think we could add such a column to all download files?

I think eBMS already has the taxa labels for the different insects studied: moth, butterfly, dragonfly and bumblebee.