Filters, sorting and orders

I’ve added some more new functionality to the species list. Firstly, it is possible to completely hide the thumbnails, or to shrink them so that they don’t make the page any longer than it needs to be. Previously, the list was sorted automatically first by class, then by common name within that class. I have changed this so that it now sorts by common name initially. However, it is now possible to choose to re-sort the list by either common name, binomial name, class or date. The resulting list can be viewed in ascending or descending order. All settings are persistent until you stop viewing the species list.