Hex maps - option to select species

Hi All,

Function to select species to show in hex map, rather than the default ones now. Add Hedgehog, mouse specifically, and also option to select others, even if catches are not in the top 5 recorded.

As a small village project, we would like to be able to tailor the hex species. Even though stoat and weasel catches are very low in our little project they are a big deal when caught, so good to have the option to pick them to show.