Fix the way that MINC IO handles null-termination.
When vtkMINCImageReader creates a vtkCharArray to store a NetCDF attibute, it allocates one more byte than the number of chars, in order to make room for a null terminator. The way it did so was unsafe and incompatible with the new vtkGenericDataArray changes. This new code does the same thing, but in a compatible manner.
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