[bzr-loom:MERGE] Fix deprecation warnings

[Aaron Bentley]

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Hi all, and especially Rob.

I've updated looms to fix the deprecation warnings they were getting
with bzr.dev.

I also have some other patches waiting for your approval:

   87 Aaron Bentley	2008-04-25
      Add --base option to loomify, to set the branch nick

   86 Aaron Bentley	2008-04-24
      Implement as_revision_id for thread revision spec

   85 Aaron Bentley	2008-04-24 [merge]
      Merge bzr-loom

   84 Aaron Bentley	2008-04-24
      Allow combine-thread to delete the bottom thread (#194274)

   83 Aaron Bentley	2008-04-24
      Refactor, producing get_previous_thread and moving thread_index to
LoomState

   82 Aaron Bentley	2008-04-04
      Fix out-of-date error, refactor slightly
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