3D plot experiments

Hi John,

I will, but it's very much work in progress....
There are

hardly any comments, but there are a few tests at the bottom



Very nice work, the script are working nice... mhm, I didn't
understand the problem about WXAgg, I just commented out the lines
involving self.toolbar.something, changed the default backend, and it's
working also with WXAgg. But probably I did not understood correctly
your email.

Thanks for the nice job.