Clean up setup instructions
Recent message from QA mailing list (permalink) has some ideas how wiki page could be improved. It also gives clearer instructions how to set up working bibisect dir.
It would be good to merge that message into wiki page. I'll try to do this myself when I find some time, but can not promise exact date. If anyone has some spare time in his hands, please consider this task. --Mirosław Zalewski (talk) 2013-10-25T20:55:02 (UTC)