Python module mismatch

[Hal Murray]

Gary said:
> I installed for Python 2.7, then I installed for Python 3.6.  Then I ran with
> python3.6, but my PYTHONPAATH was still for 2.7. 

Do typical installations run mixed python 2 and 3 like that, or is that only 
used for testing?

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I think the mixed case can be made to work with something like:

WHEN=`date +%s`
puthon2 ./waf configure --build-epoch=$WHEN build install
puthon3 ./waf configure --build-epoch=$WHEN build install

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Can we make waf smart enough to install both flavors?  I'm thinking of 
something like call out to the other python to find out where to install the 
python libraries and make the binaries.

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