branching over bzr+ssh does not propogate loom threads

I'm not sure it's the same bug, but `bzr branch bzr://host/loom` also does not work correctly.

> I'm not sure it's the same bug, but `bzr branch bzr://host/loom` also
> does not work correctly.

Yes, that's the same bug. The remote object logic is the same regardless of the
medium the smart protocol is using.

This is probably the same error as when you branch after creating a loom but never run "bzr record" on the original loomified branch. Here is a simple script which tests the problem.

---------------------
#!/bin/bash

mkdir foo
cd foo
bzr init
touch bar
bzr add bar
bzr commit -m 'added bar'

bzr nick trunk
bzr loomify
echo "%%% The loom exists, sorta %%%"
bzr show-loom
# don't bzr record

cd ..
bzr branch foo foo2
cd foo2
echo "%%% The branched loom doesn't exist %%%"
bzr show-loom
bzr nick trunk2
echo "%%% The branch is in loom format but without a loom %%%"
bzr loomify