[issue1647] IDLE messes around with sys.exitfunc

[Kurt B. Kaiser]

Kurt B. Kaiser added the comment:

It was done for VPython support, as described in the docstring in 
run.py:exit().  What are you doing, removing sys.exitfunc from 
2.6? 

The 3.0 run.py code was changed to use atexit._clear().

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