[IronPython] Setting tb_next

[Dan Eloff]

It's readonly in Python, and that's the way it's meant to be. But I'm
porting Jinja2 to IronPython (Silverlight hopefully) and Jinja uses
ctypes to dig deep into CPython's guts and make a function for setting
tb_next on traceback objects. Playing by the same dirty, no holds
barred rules, is there a way to set tb_next on traceback objects in
IronPython?

Thanks,
-Dan