Fixing missing neg in lattitude
Setting the ocean to a default blue

These other commented out colors are for export to PNG when I want only
the data points displayed.
Better default river styles

We only really have two river ranks. This implements a two layer river
styling which looks nice.
Better land color options
Better country boundaries
Simplifying rank styling

This comments out most of the styling. This is in favor of some simple
rules for the dynamic map.