[MERGE] Allow appending path segments to the :<name> style aliases.

[Michael Hudson]

This simple patch extends the directory service to allow path segments
after the name of a branch location alias.  For example you could do
this in a lightweight checkout of a loom to push a non-loomified version
of the current thread of the loom to its default location:

bzr export-loom :this; bzr push -d :this/`bzr nick`

Cheers,
mwh
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