[MERGE] Produce a traceback for most lock errors

[Aaron Bentley]

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Since BzrNewError was removed, all errors are treated as user errors by
default, rather than internal errors.

However, most lock errors are internal errors, not user errors.

This patch turns most lock errors into internal errors, the exceptions
being lock contention errors and lock-breaking errors.

Aaron

BTW, I'm not sure that it was correct to make errors default to user
errors.  I suspect that user errors are the minority.
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