Decide on name for "native range" in description

[peterdesmet]

The description extension currently uses the type name "native range" for Americas, Australasia, etc. We need to decide if we want to keep it that way.

The name "native range" came up in this discussion: qgroom/ias-dwc-proposal#5 and is what was suggested as a term here

[qgroom]

PlinianCore uses the term Distribution, but I don't feel that helps much.

[LienReyserhove]

We decided to use the term native range in the description extension. See also #28