Prevent memory leak of vtkImageData
Prevent memory leak of vtkImageData

The copy of the vtkImageData made in the DataSource constructor that
takes a vtkImageData needs to be Delete()'d to prevent a memory leak.

OpenChemistry/tomviz,mathturtle/tomviz,mathturtle/tomviz,OpenChemistry/tomviz,OpenChemistry/tomviz,mathturtle/tomviz,OpenChemistry/tomviz