added DPoint2 unary minus operator
added DPoint2 unary minus operator

seanisom/vtp,nakijun/vtp,seanisom/vtp,nakijun/vtp,markraz/vtp,seanisom/vtp,seanisom/vtp,nakijun/vtp,markraz/vtp,markraz/vtp,markraz/vtp,nakijun/vtp,nakijun/vtp,seanisom/vtp,markraz/vtp