Clean and uniformize vtkPoints & vtkPoints2D.
MTime is now also modified on Initialize, Reset and SetNumberOfPoints. This allows a recomputation of bounding box when the point set content drastically change. Initial boundary is also now set as undefined instead of [0-1]. Change-Id: Idd1d8d3c68f0e09ddcef8a6f9db2622512f2643a
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