more options with mapping

[meghalithic]

Hi!

It'd be great to have more options when it comes to mapping occurrences. Like, choosing the point size or color to represent number of occurrences or richness. Or, to add color to represent temporal extent.

I am also curious what grid cell size is used for binning occurrence? I tried looking through the functions, but couldn't figure out how "pdbd_map_occur" bins the occurrence data.

Thanks!