pypy revisited

[Paddy]

I had another play with pypy and it seems to behave well with most pi3d functionality. on ubuntu laptop at least. 

http://pi3d.github.io/html/FAQ.html#pypy

unfortunately the version on raspbian is 4.0 and pypy-numpy requires 4.4 so very long compil left runninh overnight! will post results later. 

[Paddy]

Compiling not necessary (or probably possible on rpi) but binary available for raspbian. Various slightly quirky things needed but nothing too bad. See link above to FAQ #pypy