grafx - Extensible Java Graphics Package Code

In NaNTest adding some additional test cases for fillPolygon().

In FloatPolyEdge, moving numNodes() to the bottom of file (it's a debugging
call), making incrementY() private (was protected, I don't know why), and
adding printNodes() for debugging purposes.

In FloatPolyEdge, making numNodes() package visible. It used to be private and
not used anywhere. So why even have it?

Adding NaN handling in line drawing, 2D rendering.

Adding to NaNTest. I have work to do.

Adding more to NaNTest.

Adding NaNTest. Will add more.

Fudging the user drop block initiation delay. Even for pos.getZ() == 0.

I think these will be the final settings for
RATIO_APPROX_ROT_ANIM_TO_USER_DROP_ANIM and associated 'fraction'.

Forgot to use 'fraction'.