[Rd] wrong axis scale when plotting on a filled.contour plot (PR#3596)

[gruteser at colorado.edu]

Full_Name: Marco Gruteser
Version: 1.7.1
OS: Win XP
Submission from: (NULL) (129.34.20.16)


Let's generate a dummy filled.contour plot

> x <- 1:10
> y <- 1:10
> z <- array(rep(0, times=100),dim=c(10,10))
> filled.contour(x,y,z)

And try to add some points to it, e.g.

> points(8,2)
> points(6,2)

The points show up misaligned with the axis 
somewhere at 9.9,2 and 7.5,2

It appears that the "z value legend" on the right
may have distorted the axis.