Renaming the SingleArraySelectionWidget to DataArraySelectionWidget. Updating all sources effected by the change. Most filters that used the FilterParameterWidget::SingleArraySelectionWidget were NOT updated so that someone MUST go through these filters to update their codes to use the new DataArrayPath object to describe the path to the DataArray. VectorSegmentFeatures has been updated with the latest ideas incorporated into the 'dataCheck()'. A new method was added to the DataContainerArray that allows the programmer to directly get a prereq array using the DataArrayPath class.