[Rd] contour() labels (PR#441)

[Ray.Brownrigg@mcs.vuw.ac.nz]

R-0.99.0a now plots contour labels from contour(), but the values in
levels seem to be coerced to integer.

Reproduce by:
> set.seed(2)
> contour(matrix(runif(36),nrow=6), labcex=1.2)

and compare with:
> set.seed(2)
> contour(matrix(10*runif(36),nrow=6), labcex=1.2)

Ray Brownrigg

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