issues with *.amrspcth data files

This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

When I load a .amrspcth data file (e.g., //kitwarenas2/share/Datasets/SPCTH/BallAMR/BallAMR.amrspcth, on the Information tab, the data set type is listed as "Unknown". Also the contour filter on the toolbar is grayed out. "CTH AMR Contour" is available from the Filter menu, but it would be nice to make the contour filter "do the right thing" when it encounters AMR data.

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