Expose mode-shape-range meta-data to downstream filters.
Filters downstream from vtkExodusIIReader has access to mode_shape in FieldData, but there was no way of getting information for the range of the mode shapes. This changes added support for a new "mode_shape_range" array that provides this meta-data. Also adding "mode_shape" and "mode_shape_range" arrays only when HasModeShapes is true. Otherwise, these variables are meaningless.
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