the REST API in a manner analogous to that of the EventLog objects.
Also updated the VOEvent such that IVORNs include an incrementing
serial number and the Citations section contains appropriate
references to earlier VOEvents.

Made changes to bring VOEvent closer in-line with what Mina and Peter are proposing. However, I still don't have their AlertVersion property. Nor do I have any of the analysis specific stuff, like ChripMass, frequency, etc.