[Bf-python] Automatically set bone roll

[Ryan Cushman]

Has anyone done any work with automatically setting bone roll via vector
math?  I know I can cross product the incoming and outgoing vectors to get
the normal, I'm just not entirely sure what to do with that to set the roll
property.  I'm in 2.5 but the logic will be the same as in 2.4.   Thanks!
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