Comment 7 for bug 387717

This bug has shifted a bit from David's original filing. Here's the rationale:

- He originally asked for progress bars not to be sent to stderr. If we are going to show progress bars, there is no better place to send them.
- He also asked for progress bars to be off by default; I'm not going to do that but there is another bug 388275 asking for a way to permanently turn them off in a file. You can turn them off in current trunk using BZR_PROGRESS_BAR=none.
- He's correct that we don't handle some cases of redirection correctly.

Therefore the remainder of this bug is that autodetection on redirected stderr is imperfect. The attached branch addresses this but has some failing tests.