Better Refueling v0.5 (Beta).

This version will allow you to choose which vehicle in range to refuel.  Flood fill lets you refuel compatible vehicles with a fuel truck much faster.

Variables to control the new refueling listed below.  I would suggest they are left at their default values if reasonable accuracy.
- DZE_RefuelRange = How far from the fuel truck it will search for valid vehicles to list.
- DZE_RB_pumpspeed_truck = How many liters the truck fills per cycle.
- DZE_RB_pumpspeed_flood = How many liters the truck fills a flood fill compatible vehicle.

The other new variables should be left as they are for now.