Migration to Python 3

Python versions prior to 3.3 use VS2008, but Python 3.3 is compiled with VS2010. So actually you might run into problems with VS2008. I use VS2010 for more than two years now to compile Panda3D, and had no problems so far. There is just a tiny modification needed so makepanda will find the Win7 SDK.

I will try and compile with Python 3.3 one of the next days.

By the way: are you using 2to3 for the Panda3D Python code? Updating by hand is - in my opinion - way too error prone.