[MERGE] Use get_parent_map RPC in InterRepo methods

[Andrew Bennetts]

Robert Collins wrote:
> On Wed, 2008-09-24 at 15:51 +1000, Andrew Bennetts wrote:
> > InterOtherToRemoteRepo delegates most of its work to a “_real_inter”
> > that uses the _real_repository of the RemoteRepository. 
> 
> Do we still need this special case at all ?

Yes.  It seems like a reasonable approach; e.g. it's where the code to trigger
the get/insert_data_stream RPC used to live, and it's where I expect to put the
equivalent for get/insert_record_stream.

What alternative do you see?

-Andrew.