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Fix example of defining a derived portal with Set

Kenneth Moreland requested to merge kmorel/vtk-m-user-guide:const-portals-have-no-set into master

A recent change to VTK-m made sure that the Set method was removed from portals (particularly the control portal of basic arrays) that are read- only. Because of this, a portal for a derived array needs to be more careful about not using a Set method that is not there.

Put in a template using SFINAE to remove the Set method when the derived array(s) do not have Set. (This is not explained in the text, though.)

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