Vcs3d unstructured grid plot improvements

Fixes a hang that occurs in communication with sub-procs when plotting an unstructured grid variable in vcs3D.  Also adds some diagnostics.
>> @ThomasMaxwell<https://github.com/ThomasMaxwell> so I can comment thie line out, right?

I use the 'printParameterValues' feature frequently (I'm currently using it to develop the gallery scripts), but for for today's release you can feel free to comment it out.   I can hook it up to a separate key event for ongoing work.

In Packages/DV3D/DV3DPlot.py:

> @@ -360,7 +360,8 @@ def changeButtonActivations(self, activation_list ):
>              self.changeButtonActivation( *activation_spec )
>
>      def saveState(self, **args):
> -        print "Save State"
> +        #print "Save State"
> +        self.printParameterValues()



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