[RFC] Repository fasçade

[Aaron Bentley]

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Hi all,

There are at least two major changes planned in terms of the repository API:
1. the repository stacking API
2. the elimination of versionedfile from the public interface

The repository stacking API involves implementing the repository API
anew, on top of a collection of repositories.  The smaller the
repository API, the easier this work is.

I expect that removing all traces of versionedfiles from the repository
API will be difficult.

Therefore, perhaps it makes sense to start from the opposite direction,
and implement a new repository API.  StackedRepository would be one
implementation, and we can either implement the new API on our existing
repositories, or create a new RepositoryFascade class to wrap
implementations of the current API.

I think that this would produce a cleaner API that would be
better-suited to stacking.

Thoughts?

Aaron
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