Replaced many trivial uses of sprintf with snprintf

Charts/Core/Testing/Cxx/TestBoxPlot.cxx

Charts/Core/Testing/Cxx/TestBoxPlot2.cxx

Common/Core/Testing/Cxx/otherStringArray.cxx

Common/DataModel/Testing/Cxx/otherFieldData.cxx

Filters/Parallel/vtkPKdTree.cxx

Geovis/Core/vtkGeoAlignedImageRepresentation.cxx

Geovis/Core/vtkGeoImageNode.cxx

Geovis/Core/vtkGeoTerrain.cxx

IO/Core/vtkWriter.cxx

IO/EnSight/vtkEnSightReader.cxx

IO/Exodus/vtkExodusIIReader.cxx

IO/Exodus/vtkExodusIIWriter.cxx

IO/Export/vtkOBJExporter.cxx

IO/Export/vtkX3DExporter.cxx

IO/Export/vtkX3DExporterXMLWriter.cxx

IO/Geometry/vtkMFIXReader.cxx

IO/Geometry/vtkSTLWriter.cxx

IO/Geometry/vtkTecplotReader.cxx

IO/Image/vtkGESignaReader.cxx

IO/Image/vtkVolume16Reader.cxx