[MERGE] prepare for CHKInventory in memorytree/mutabletree (brisbane)

[John Arbash Meinel]

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Ian Clatworthy wrote:
> This is rev3838 from brisbane-core. Vincent needed to
> introduce this to get the test suite passing after
> CHKInventories were introduced. They may be other ways
> of solving the issue but this works (and the introduced
> method is private).
> 
> I'm putting this up for review separately because it's
> an isolated change that removes 2 modified files off
> my list of differences between bzr.dev & brisbane-core.
> 
> Ian C.
> 

BB:approve

The basic issue is that MemoryTree needs to have something mutable, just
like WorkingTrees do. Currently that is provided by Inventory, while
CHKInventory is not directly mutable. The code was assuming it could
just mutate the inventory from a revision tree (as long as it didn't
keep that RT around).

John
=:->
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