Very small update to address a bug introduced with yesterdays update.

Fixes:

Caravel now calculates wind in world space rather than local -- which will correct the incorrect presentation of wind direction.

Several (minor) further changes to hull water displacement to address sudden submarine-ing. Displacement surfaces will now disable briefly on world recenter, and will disable entirely if the ship is >50% of max cargo capacity. This will result in some water clipping over the deck, but *should* improve stability.