[RFC] Repository facade implementation

[Aaron Bentley]

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Hi all,

Here's an implementation of the repository façade concept.

There are two implementations: VersionedFileRepository and
StackedRepository.

It changes RevisionTree to use a VersionedFileRepository, mainly for
testing purposes.  The only uses of get_weave remaining are for weave
merge (handled in another patch) and Tree.check.

I am trying to structure it so that the RepositoryFacade class provides
the user-facing functionality, via the template method.

Subclasses must implement _iter_revisions and _iter_file_lines, so far.
 Of course, they can also override RepositoryFacade methods if they like.

Aaron
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