Waiting Zones now have Capacity

• The default Capacity is zero. Links using Target Availability to any Waiting Zones do not send any entities.
• Added a call to SetServiceCapacity( ccc ) where any Waiting Zone is created, where ccc is the maximum capacity of the Waiting Zone.

Platform - Train Interface (PTI)

Populate alighters near the doors - A new option in Train Services. Alighting entities are usually distributed randomly throughout a Service's Carriage interiors. Checking this option populates alighting entities next to the Train doors in a Service's Carriages, producing a less impeded alighting behavior.