[MERGE] support updating lightweight checkouts of readonly branches

[Aaron Bentley]

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Hi all,

This patch fixes the update code so that it works on lightweight
checkouts of readonly branches.  This is probably most useful for
same-location development.

For example, at work, it allows me to make checkouts of colleagues'
work, and update them as my colleagues progress.

It also allows me to install bzr and bzrtools on my colleagues' machines
as checkouts of my own bzr and bzrtools branches, so they can easily
update to the latest version as appropriate.

Finally, it starts the work of disentangling the tree and branch
updates.  Eventually, I expect _update_tree to become a public method
that updates the tree to the latest branch revision, and to fix "bzr
update" so that it handles conflicts better.

Aaron
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