[opensuse-buildservice] [PATCH] optionally show tracebacks upon (many) osc errors

Yo Attached is a patch that shows tracebacks upon many osc errors. It's probably not complete. The motivation is that when working on plugins (and, I assume, osc itself), messages you get from the following except AttributeError, e: print >>sys.stderr, e return 1 aren't very helpful, because there's little indication where the problem lies. But when I add show-python-tracebacks = true to my ~/.oscrc, I can see exactly where and how I'm screwing up -- pretty useful. I have only been running with this patch for about an hour, but it seems to work pretty well so far. Michael.