Location information requirement for event

[ahokkonen]

@cookeac @erwinspeybroeck @alamers

"location" is not set as required for event resources nor for base core resource (icarEventCoreResource). Is this correct or should location information be always mandatory for events?

Another thing is that in some events required undefined fields:

• icarMovementArrivalEventResource.json - requirements refers to nonexisting field "originLocation"
• icarMovementDepartureEventResource.json.json - requirements refers to nonexisting field "destinationLocation"

[ahokkonen]

This is duplicate and should be closed/deleted
Please, refer to #86