[Paraview] Annotate time as data/time using pythonannotation and programmablefilter

[Utkarsh Ayachit]

>
> Array Association: Row Data
> Expression: "{}".format(input.RowData)
> But this gives me just a reference to the row data, not the string of the
> date/time I just stored
>

Try using `input.RowData["datatime"].GetValue(0)` instead. String arrays
are a little cumbersome currently. You have to use the vtkAbstractArray API
(GetValue) to access elements.

Utkarsh
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