[MERGE] move smart_add_tree to MutableTree, tested on WorkingTree..

[Robert Collins]

This moves smart_add_tree as I discussed yesterday. Because its not
fully refactored - it still uses inventory, and uses os specific
functions not transport functions while it is on MutableTree (where i
think it should be), its only functional on WorkingTree today.

I think this is ok, as it is an improvement over the previous location
(Tree's can now override it), and refactoring further to let tree
perform the listdir etc so that MemoryTree works should not be hard -
but won't buy anything today.

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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