Small typo in abline.R

I found a small typo in abline.R where the line:

  warning("only using the first two of ",p, "regression coefficients")

should have a space before the word 'regression'.

Thank you, but this should really be (for translation purposes)

warning(gettextf("only using the first two of %d regression coefficients", p), domain = NA)

and messages are frozen in pre-2.11.0 as we are in the translation 
window.  So the correction won't appear for a while.

Thanks,

Stephen

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Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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