Remove "Vetted" param
Our VOEvents contain the following param:
<Param name="Vetted" dataType="int" value="0" ucd="meta.number" unit=""> <Description> Indicates whether this candidate has undergone basic vetting by humans </Description> </Param>
However, this is redundant because we define preliminary alerts as alerts that have not undergone human vetting whereas initial, update, and retraction alerts have been vetted.
I suggest removing this flag. If we want to preserve the human-readable comment, then it can go inside