Small Melange Update

[Gobalopper]

Stuart sent along a small update for Melange, just the Arrakis page has changed:

Arrakis:

- Completely rewrote the polar terrain section. Thanks to Maurice for his email insights.

- Added section on Lighting Effects.

- Mentioned that sand can vary in texture, making it easier or harder to travel across it. This also has an effect on the sand worms (if they are around at all), and therefore immediately on how much spice is available in the region.

- Coarse grains are found on the downwind sides of dunes. The windward side is packed smooth and hard. This effects unit movement depending on which slope you are traversing.

- If a prerequisite building is destroyed, you lose access to the Unit.