ENH: Adding types "long long" and "__int64" as native types for platforms on which they are available and distinct.  At least one of these types seems to be available everywhere which should allow 64-bit integer data to be processed even when not using 64-bit ids.  The macros VTK_TYPE_USE_LONG_LONG and VTK_TYPE_USE___INT64 are defined to indicate that their corresponding types should be used.  The vtkTemplateMacro includes these types automatically.