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Improvements on different readers ,writers and datamodels so they can handle bigger files

Mathieu Westphal (Kitware) requested to merge mwestphal/vtk:ReplaceStatUseWithTestFileAccess into master

This MR is in three commits :

  • A commit that replace stat() usage by vtksys::SystemTools::Stat so bigger than 4Gb can be opened on windows, on multiple readers.
  • A commit that replace int usage to vtkIdType for numCells/numPoints/numRows in legacy readers and writers, so bigger topology than INT_MAX can be opened.
  • A commit that ensure NumberOfPoints and NumberOfCells computation are made in vtkIdType, not int

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