One entity was having its info shown, even though it was not selected

Entities now have their templates cloned (by serializing and parsing) to allow for
a single object to be passed in repeatedly.

It was an array, for some reason

This is handled as part of the attribution data now. It was unused
for quite some time, but I kept adding 'em anyway!

displayEntity() now only triggers a refresh of the world if asked, and
the scale is only redrawn if the world's size has changed

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.

Also makes the scale input behave like the rest - change, not input

Otherwise, you could load a giant scene, close the browser, and be stuck with
it forever!

This reverts commit 4c58eb9b94.

This reverts commit 7182f0479e.

Still very rough around the edges...