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Unstructured span space: new scalar tree to accelerate isocontouring

Will Schroeder requested to merge will.schroeder/vtk:Unstructured-Span-Space into master

The scalar tree machinery was not working quite right with vtkContourFilter, vtkContourGrid and vtkSMPContourGrid. This was improved.

vtkSimpleScalarTree was improved to support threading. This required building a thread-safe API.

A new class vtkSpanSpace (subclass of vtkScalarTree) was added. It support both serial and parallel interface.

Finally, vtkSMPContourGrid was extended to use scalar trees.

A test was added to exercise these classes (there was no test before).

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