Add GUI warning if an endosymbiosis candidate is not present in the current patch

[hhyyrylainen]

so that the player can make more sensible choices in what they want to endosymbiosise. It shouldn't be too hard to preprocess the list of candidate species and include info on if they are in the current patch (or what patch they are in) and then show in the GUI preferably the species present in current patch (and warning on species not in the current patch).