[vtkusers] more local control for thin plate transform

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Hello Qing,

[]

Thanks for answer.

QH> it is a good idea to add more additional landmark points.

I'm afraid that these points maybe very many (~500-600), so TPS algo
will consume mauch time.
I have idea to split shape into two parts: one - to deform and
another - a part that will stay unchanged. And then merge them.
But I don't know how to realize that...