Branches without working trees

[John A Meinel]

Attached is a patch which allows for branches which do not have a
working tree. It is also available as a branch here:
http://bzr.arbash-meinel.com/branches/bzr/no-working-tree/

I think this makes sense for published repositories.

This means I moved "WorkingTree.pull()" back into Branch.

I also implemented "cmd_push" as a form of pull() with the targets
reversed. To do this, I have pull() check to make sure that if there is
a working tree, the branch is local.

I also allow for a separate .bzr/x-push-target location. For some
working models, you might have a default upstream, with a different
default push location.

For example, I might try and keep a branch up-to-date with bzr.dev, but
then push the results to *my* published repository.
Having a push target different than parent allows me to "bzr merge",
"bzr commit", "bzr push", without having to specify any locations.

This is not truly required, but I think it is helpful.
Another possibility would be to just have a primary parent, and an
alternate parent. So you could do:

bzr merge --alternate
bzr push

We could also do something like --friends, which contains a list of the
recent push/pull locations. Then it would look like:

bzr merge --friends=1
bzr push --friends=2
bzr missing # The primary friend is the parent

This is getting pretty close to having branch aliases, which might be a
better solution.

The doubt in my mind is why I made it a separate patch.

John
=:->
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