Don't use sys.stderr as a default value
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Certan tools like pytest and other things mess with the value of `sys.stderr`. If we import progressbar before pytest has messed with it, then `ProgressBar`'s default `fd` value will remain unmessed-with, potentially causing test failures if we're trying to test our progressbar output.
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Certan tools like pytest and other things mess with the value of
sys.stderr. If we import progressbar before pytest has messed with it, thenProgressBar's defaultfdvalue will remain unmessed-with, potentially causing test failures if we're trying to test our progressbar output.