[Rd] panel.first for bxp

[Manuel López-Ibáñez]

I am intrigued why bxp does not support panel.first in order to draw a grid 
behind the boxplots. The advice given here:

https://stat.ethz.ch/pipermail/r-help/2006-April/104608.html

seems utterly bogus, and the result is noticeably different in PDF.

I would propose the following patch, which follows what is done for 
plot.default. If it is ok, I can produce also patches for the documentation.

Please apply to:

https://svn.r-project.org/R/trunk/src/library/graphics/R/boxplot.R

Cheers,
	Manuel.


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