[Sidefx-houdini-list] copy a changed otl

[François Duchesneau]

I agree. I had the exact same problem today and I was quite surprised I 
can't do it. In my case it was a channel curve and I wasn't even able to 
copy paste it from the take to main :(

Maybe in some situation it could be useful too to be able to copy/move 
parameters from one take or main to an other take.

François
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> I'd love to be able to promote the existing state, back to main...
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