[docs] [issue12760] Add create mode to open()

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> C11 uses 'x' for this, for what it's worth.
> 
> This is not a "duplicate issue". The openat solution is no easier than 
> the os.open solution.

Ok, let's re-open then. I'm not sold on the feature, but the fact C11 adds a dedicated letter mode for it could be a good excuse for us to mimick it :)

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resolution: duplicate -> 
status: closed -> open
superseder: io.FileIO and io.open should support openat -> 

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<http://bugs.python.org/issue12760>
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