prevent pygame timeout disfunction

Since new PyGame timing, 0 ms does not do the trick anymore (timing was millisecond accurate, so could not see difference between 0 and a really short time below 1 ms). We now need a timeout of a bit over 0 ms to achieve the same effect.

PyGame timeout is at 0 ms, because (for some reason) it really slows down drawing when it's at 1 ms. Don't have a clue why, though...