Worried by Source->Output registering

[John Biddiscombe]

>If the data is being held onto by the application, then the filter that 
>produced it might be needed. To indicate that only the data is of interest 
>you can do
>
>data->SetSource(NULL);
>
>and that should break the chain and free the filter.

I'd like to add
vtkSource::UnregisterAllOutputs()
to loop over all outputs and do 
	output[i]->SetSource(NULL);

for all outputs.

Any objections ?

JB
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