[bzr-loom:MERGE] Show current thread in 'status' (fixes bug 232465)

[Jonathan Lange]

Hello all,

I hacked this one up over the weekend. This branch adds an overlay to
'bzr status' that shows the current thread if you are looking at a
loom.

Output looks something like:
  $ bzr st
  Current thread: experiment-with-threads
  M barlib/foo.py

This has already made my life with looms a lot easier.

The code I've added roughly parallels the existing code to overlay the
'switch' command, and the test I've added is blackbox.

My biggest worry with the patch is that it slows down the performance
of status. I'd appreciate guidance on how to minimize this slowdown.

cheers,
jml
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