[MERGE] Convert workingtree.py's use of lock_write to lock_tree_write

[John Arbash Meinel]

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Robert Collins wrote:
> All WorkingTree methods which write to the tree, but not to the branch
> have been converted to use ``needs_tree_write_lock`` rather than
> ``needs_write_lock``. Also converted is the revert, conflicts and tree
> transform modules. This provides a modest performance improvement on
> metadir style trees, due to the reduce lock-acquisition, and a more
> significant performance improvement on lightweight checkouts from
> remote branches, where trivial operations used to pay a significant
> penalty. It also provides the basis for allowing readonly checkouts.
> (Robert Collins)
> 
> (Hopefully thats self explanatory :)
> 
> Next up: anonymous/readonly checkouts.
> 
> -Rob
> 
...

> @@ -195,6 +200,7 @@
>          builder.merge(interesting_ids=["1"])
>          self.assertEqual(builder.this.get_file("1").read(), "text4" )
>          self.assertEqual(builder.this.get_file("2").read(), "hello1" )
> +        builder.cleanup()
>          
>      def test_file_moves(self):
>          """Test moves"""

^- Why all the additions of 'builder.cleanup()'?

Otherwise +1.

John
=:->
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