[MERGE (trunk, 1.1)] fuller deprecation of Graph.get_parents

[Aaron Bentley]

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Robert Collins wrote:
> This is a fuller deprecation of Graph.get_parents.

bb:approve

> 
> Specifically the following two things work which did not in 1.1:
>  - Graph.get_parents will work with a provider that implements 
>    get_parent_map only.
>  - Graph.get_parent_map will work with a provider that implements
>    get_parents_only.

You could make this emit a deprecation warning if you like.

> I deleted the implementations of get_parents on the stock providers as
> they seem unneeded to me- the API for callers is Graph itself, not the
> Provider objects - Provider is an implementors interface.

I agree, and had already suggested this.

Aaron
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