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

[Robert Collins]

This is a fuller deprecation of Graph.get_parents.

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.

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. 

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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