add ploidy line in species catalog description

[lauterbur]

Now that ploidy is a property of species, it would be useful to have that information front and center in the catalog, i.e.:

(It seems obvious for some species, but it's vital information for species in which it's not straightforward, such as Apis.)

[lauterbur]

This should perhaps be added to the genome table instead since ploidy can be different on different chromosomes: