[PATCH] Still more useful traces

[David Allouche]

Here's a new patch for trace.py.

Print the repr of PWD instead of the str, which is useful to understand
errors with fancy non-ascii directory names.

Set the logging level of the root logger, so setting BZR_DEBUG gives
debugging output from non-bzr code. I found that useful to get pybaz
debug logging while working on baz2bzr.
-- 
                                                            -- ddaa
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