I wanted to project a land and ocean map together, but that didn't give me filled-in oceans. Will
look at this again at some point.

Cloning an existing unit and changing its value is a fair bit faster.

Also remove a spurious info file for countries

This also updates the attribution system so that entire folders can be covered
by a single entry. It assumes every file has the same source.

Each entity now has an info object, a views list, and a sizes list.
This will allow for more complex bio/description text

units