[Bug 28930] Only print messages (and tracebacks) to stderr if BUTTERFLY_DEBUG=all

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28930

--- Comment #1 from Jonny Lamb <jonny.lamb at collabora.co.uk> 2010-07-06 05:46:32 PDT ---
I'm open to suggestions how this could be achieved in a nicer way?

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