[vtkusers] int instead of vtkIdType

[Kevin H. Hobbs]

David Doria wrote:
> It seems that vtkIdType is the expected type for indices. ie
> void GetTupleValue (vtkIdType i, unsigned char *tuple)
>
> I usually do
>
> unsigned char *tuple;
>
> for(int i = 0; i < something; i++
>    GetTupleValue (i, tuple);
>
> Is this a bad idea?
>   
Use vtkIdType so that your code will automatically switch to 64 bit IDs 
when VTK is configured to use them.

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