common: improve backtrace function
authorBrian Norris <banorris@uci.edu>
Sat, 6 Oct 2012 02:34:01 +0000 (19:34 -0700)
committerBrian Norris <banorris@uci.edu>
Sun, 7 Oct 2012 23:27:19 +0000 (16:27 -0700)
Utilize freely-available backtrace function that helps make output more
readable. Previous implementation is kept for now, as it is simpler and
more well-tested.


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