[rfc] bzr-colo into core

[Alexander Belchenko]

Marius Kruger пишет:
> One possible solution to wanting multiple working trees may be:
> Make it real easy/nice to have a lightweight checkout of one of the
> branches in a colocated ehm..branch/dir/repo (do we have a name for this?),
> then make it easy to switch to one of its peer colocated branches.

I think it's already supported in bzr-colo with `colo-checkout` command 
and `colo:` path alias.