If multiple location promotions are trigger-able at one location, if trigger type is set to VPLMultipleTriggerOnRefreshTypeTriggerOnce, only one of the promotions will trigger (priority is based on the order of promotions at input).  If trigger type is set to all, all promotions will trigger at once. 

I can 
1. Always default to VPLMultipleTriggerOnRefreshTypeTriggerOnce
2. Better clarify/rename VPLMultipleType

What do you think?