workaround for 32-bit python

I have been worried that I wouldn't be able to do Vpython on my
machine, because I had to install 64-bit Python for another package
that I needed for work.

My son found a good workaround for me:

	arch -i386 python 4p90.py  
(on some machines, 
	arch -32 python 4p90.py
)

This forces the 32-bit architecture, even though the 64-bit Python is
installed. (I don't use IDLE or the Vpython version of IDLE, so I
don't know whether they work this way or not.)

It might be worthwhile for other people dealing with the 32-bit Python
on the Mac problem to try playing with this.  If it works generally,
it might be worth adding to the documentation.

Kevin Karplus

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