URL directories not expanded in bzr send

[Dimitri John Ledkov]

$bzr send :parent :push

The bundle applies fine. But the targe_branch and source_branch are not expanded back to url's leaving little meaning.

# Bazaar merge directive format 2 (Bazaar 0.90)
# revision_id: <email address hidden>-\
# x9aqkwhro6egbccs
# target_branch: :parent
# testament_sha1: 1477a84e1f16382b5f5222bb39c3bb63b4ff793d
# timestamp: 2009-12-10 00:13:43 +0000
# source_branch: :push
# base_revision_id: <email address hidden>-\
# d0givvqhqrka5bv9
#
# Begin patch
# Begin bundle
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