[Bf-cycles] Unique socket names?

[Campbell Barton]

Hi, recently I've been using python to create a node-tree, and ran
into a limit with socket names.

The 'Mix' and 'Add' shader nodes have both sockets named 'Shader',
this means Python can't usefully reference them by name,
instead you need to reference them by index which is more fragile
since it may break the script if sockets change order.

Is there any problem with naming these 'Shader1', 'Shader2' ? --- this
matches Color Mix which is called 'Color1', 'Color2'.

-- 
- Campbell