[MERGE] memory-tree and friends

[John Arbash Meinel]

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Robert Collins wrote:
> This is an update of a previous approved patch to add MemoryTree and
> TreeBuilder, part of my test optimisation sweep.
> 
> I think it should be fine still :)
> 
> -Rob


v- I think we decided to put the 'from bzrlib import *' on multiple lines.

> +
> +from bzrlib import errors, mutabletree
> +from bzrlib.decorators import needs_read_lock, needs_write_lock
> +from bzrlib.osutils import sha_file
> +from bzrlib.mutabletree import needs_tree_write_lock
> +from bzrlib.transport.memory import MemoryTransport
> +

I seem to recall that my only concern was MutableTree not being tested
directly. However, for now, I'm fine with just explicitly testing all of
the instances. So +1 from me. (You can chose to cleanup that one line or
not)

John
=:->
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