[Bf-compositor] Duplicate data option for node groups

[- LEON -]

Hi,

There is a question on StackExchange really hits me with a possible
improvement for node group data duplication.

http://blender.stackexchange.com/questions/3781/problem-duplicating-textures

FYI. Thanks.

-- 
Leon Cheung
a.k.a. 老猫
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