Added something I've wanted to for a long time.
Anywhere there's a b2Vec2, you should now be able to pass in a [length-2] list, tuple, or None -- (0,0). As I learn more about SWIG every time I try to throw some more functionality into Box2D.i, I'm more and more impressed with how much can be done with it.
Changes can be seen in test_ApplyForce.py and test_Web.py. I'll eventually update the rest of the testbed examples.
Oh yeah, also fixed a longtime standing bug with unset userData causing seg faults.
Any other things you can think of that would be convenient? I'll probably allow matrices in list format.
If you notice any side-effects, please let me know as always.