fixed rounding error when setting turtle position (#3163)
fixed rounding error when setting turtle position (#3163)

walterbender/turtle3D,walterbender/turtleart,walterbender/turtleconfusion,walterbender/turtleflags,AlanJAS/turtleart,walterbender/turtleartmini,walterbender/AmazonasTortuga