[MERGE] Split TransportConfig out of TreeConfig

[Aaron Bentley]

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Hi all,

While the notion of stacking locally by default has proved
controversial, the idea of allowing remote hosts to suggest stacking
policy has not been.

So here is the first patch on the road to implementing support for that.

It splits the low-level responsibilities of TreeConfig out into a new
TransportConfig class.  TransportConfig simply maintains persistent
storage of name/value pairs.

The ultimate purpose of this is to use TransportConfig as the basis for
a new BzrDirConfig associated with BzrDirs.  The initial implementation
of BzrDirConfig simply supports set_default_stack_on and
get_default_stack_on.

A possible future responsibility would be the make_working_tree setting
that is currently associated with repositories.  Repositories are meant
to be a storage optimization only, and having them control whether
working trees are created violates that concept somewhat.

Aaron
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