[Mirra] new version

[enrike]

hi all

new version of mirra is up. Mayor changes are converting Engine class
from graphics.py module into a new function based module, engine.py

So from now on all the code from Engine class is contained by the
engine.py module. This is first step towards moving all/maybe part of
that code into a C extension.

As you probably noticed the CPU usage of Python when there are more than
20-40 elements on the rendering stack increases dramatically. In our
particular case this is specially bad, we need to be able to create apps
that dont go over 15% of CPU on a machine with say 1.5G processor. We 
belive that porting engine.py to C would lead to a *massive* increase in 
the performance of Mirra.

So if you are experienced on developing C extensions to python or know
someone that could help in this we would be more than happy to receive
some any kind of help.

please report feedback, bugs, ideas, etc ...

enrike