Hiding obsolete association form
Viewhints to show join instead of datasets

Extending this change to PredictionGraphPane and SensorGraphPane.
Form for adding DataSets to GraphPanes with legend

This handles [#37445619]. The form turned out to be easier than I'd feared in the end. This commit does PredefinedGraphPanes; the next will extend the solution to PredictionGraphPanes and SensorGraphPanes.
Oops (wrong parent set in PredictionGraph)
Legend configuration for prediction and sensor graphs

Should wrap up [#37445619] except for some interface oddities