[RFC/MERGE] 'bzr --lsprof' should print even with ^C

[John Arbash Meinel]

When you run 'bzr --lsprof cmd' it generally prints out the profile
timings when the command has finished. However if you ^C the command
first, then you don't get anything.

I have a use case where I'm doing a big import, and I want to have it
just run for a little bit so I can tell what is taking so long, without
having to wait hours for it to finish.

The attached patch changes it so that if you supply --lsprof or
--lsprof-file, it will always write the profiled timings out, even if
there is an exception (like KeyboardInterrupt) raised.

This also means you can get profiles for commands that fail.

John
=:->
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