Ticket #86 (enhancement)

The error I got in trying to run it with gnuradio 2.8 is:

gnuradio_swig_python.py expects a std::vector<float,std::allocator<float>>

I had an email exchange with Mr. Cooley, and he would like to fix his code, so any effort would be appreciated in that. And, as he said in our exchange,

"Now that I think about it, the waterfall Python OpenGL code that I did was based largely upon the similar wxgui-based fft. So, following the format of the wxgui versions may help lead you to the right functional calls, and get the right calls on the GnuRadio? side."

http://alumni.media.mit.edu/~jcooley/gr_experiments/experiments/fft_3d_time/gr_3d_fft_time.htm